Consulta: subjectFacets:"Heat stress"
Registros recuperados: 81
Data/hora: 03/06/2024 03:36:01

Efecto de estrés ante-mortem en características bioquímicas que afectan la calidad de carne de pollo.
Provedor de dados: 32
Autores: Bautista Martínez, Yuridia.
Se estudiaron los efectos del estrés calórico (40° C) y  el tiempo de espera a la  matanza (h) sobre el color y las características fisicoquímicas de la carne de pechuga de pollo. Los tratamientos fueron dos horas a 40 °C (2h  EC)  y, dos horas y ocho horas sin estrés calórico (2h NO-EC y 8h NO-EC, respectivamente). La carne se obtuvo de pollos de engorda de la línea Ross de seis semanas de edad. Las variables de respuesta fueron el color en términos de L*, a* y b* (luminosidad, índice de rojo e índice de amarillo, respectivamente) y las características fisicoquímicas: pH, pérdidas por goteo (PG), resistencia  al corte (RCo, kg cm-2, y kg g-1),  rendimiento por cocción (RC) y capacidad de retención de agua (CRA). Finalizado el tiempo de espera, se midieron...
Palavras-chave: Calidad de carne; Estrés calórico; Tiempo de espera; Meat quality; Heat stress; Tiemeout; Ganadería; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/1855

Comportamiento de ganado bovino de doble propósito pastando sitios con cobertura arbórea.
Provedor de dados: 32
Autores: Pérez Hernández, Víctor Manuel.
El objetivo fue evaluar el comportamiento y fisiología de ganado bovino de doble propósito pastando sitios con cobertura arbórea alta (CAA), baja (CAB) y sin cobertura (SCA), en las épocas de lluvia y sequía. Se observaron vacas adultas durante 24 días en cada época, registrando la temperatura corporal y los tiempos que dedicaron a las distintas actividades durante el día. Las vacas dedicaron el mismo tiempo al consumo en las lluvias (P &gt; 0.05), sin embargo, hubo mayor tiempo en CAB durante la sequía (P &lt; 0.0001). Durante las lluvias, las vacas en pastoreo bajo CAA mostraron menor motivación de irse al descanso o iniciar la rumia (P&lt;0.001), y mayor hacia la exploración que en otros tratamientos (P&lt;0.001); durante la sequía, aquellas pastando en...
Palavras-chave: Comportamiento; Cobertura arbórea; Ganado bovino; Estrés calórico; Behavior; Tree cover; Cattle; Heat stress; Agroecosistemas tropicales; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/1702

Transport of broilers: load microclimate during Brazilian summer
Provedor de dados: 70
Autores: Barbosa Filho,José A. D.; Queiroz,Marília L. V.; Brasil,Daniel de F.; Vieira,Frederico M. C.; Silva,Iran J. O.
The objective of this study was to characterize the microclimatic profile of broiler transport trucks under commercial conditions, in the summer, by continuous monitoring of environmental variables (temperature and air relative humidity). Three loads were monitored from farm to slaughterhouse, considering factors such as distance and day periods (morning, afternoon, and night). To obtain the profile of the environmental variables during journey, data loggers, that determined the microclimate to which birds were submitted, were installed in the trucks; data loggers also allowed visualization of the Enthalpy Comfort Index (ECI) so that load regions could be classified according to heat comfort limits for 6-week old poultries. Temperature, relative humidity,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry farming; Animal welfare; Pre-slaughter operations; Heat stress.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000300003

Evaluation of thermorregulatory capacity of dairy buffaloes using infrared thermography
Provedor de dados: 70
Autores: Sevegnani,Kelly B; Fernandes,Danielle P. B; Silva,Silvia H. Modenese-Gorla da.
ABSTRACT The objective of this study was to evaluate the thermoregulatory response of dairy buffaloes in pre-milking and post-milking. To identify animal thermoregulatory capacity, skin surface temperatures were taken by an infrared thermometer (SST), a thermographic camera (MTBP) as well as respiratory rate records (RR). Black Globe and Humidity Index (BGHI), radiating thermal load (RTL) and enthalpy (H) were used to characterize the thermal environment. Artificial Neural Networks analyzed those indices as well as animal physiological data, using a single layer trained with the least mean square (LMS) algorithm. The results indicated that pre-milking and post-milking environments reached BGHI, RR, SST and MTBP values above thermal neutrality zone for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Buffalo; Heat stress; Respiratory rate; Surface temperature.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000100001

Respiração de sementes de cupuaçuzeiro submetidas a estresse térmico.
Provedor de dados: 14
Autores: FIGUEIREDO, F. J. C.; CARVALHO, C. J. R. de; ROCHA NETO, O. G. da.
bitstream/item/34297/1/ORIENTAL-BP1.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Estresse termico; Belem; Pará; Brasil.; Cupuaçu; Embebição; Fruta; Respiração; Semente; Theobroma Grandiflorum.; Amazonia; Heat stress; Fruits; Seeds.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/376615

Microclima e índices de conforto térmico em sistemas de integração lavoura-pecuária-floresta no município de Campo Grande, Mato Grosso do Sul.
Provedor de dados: 14
Autores: KARVATTE JUNIOR, N.; ALVES, F. V.; KLOSOWSKI, E. S.; ALMEIDA, R. G. de; TSUTSUMI, C. Y.; OLIVEIRA, C. C.
O objetivo deste trabalho foi avaliar índices de conforto térmico em sistemas de integração lavoura-pecuária-floresta, com eucalipto em arranjos de 14x2m (ILPF-1) e de 22x2m (ILPF-2) e árvores nativas dispersas com 5 árvores/ha-1 (ILPF-3), no Município de Campo Grande, Mato Grosso do Sul. O experimento foi conduzido na Embrapa Gado de Corte, em Campo Grande, MS, de julho a setembro de 2013. As avaliações foram realizadas mensalmente, em quatro dias consecutivos, em três horários (09h00, 12h00 e 15h00; GMT -04h00). Foram determinadas a temperatura do ar (°C), temperatura de globo negro (°C), temperatura de bulbo úmido (°C), umidade relativa do ar (%) e velocidade do vento (m s-1). Foram calculados o Índice de Temperatura e Umidade (ITU), Índice de...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Bem-estar animal; Estresse térmico; Sistemas de produção em integração; Integrated systems; THI; Animal welfare; Heat stress; Shade.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1056742

Restoration of the di-myo-inositol-phosphate pathway in the piezo-hyperthermophilic archaeon Thermococcus barophilus
Provedor de dados: 5
Autores: Cario, Anais; Mizgier, Alex; Thiel, Axel; Jebbar, Mohamed; Oger, Phil M.
Most Thermococcales accumulate di-myo-inositol-phosphate (DIP) as an organic solute as a response to heat stress. We have studied the accumulation of this osmolyte in the high-hydrostatic pressure adapted hyperthermophile Thermococcus barophilus. We found no accumulation of DIP under any of the stress conditions tested, although this archaeon harbors the 3 DIP synthesis genes. Lack of synthesis is due to the lack of expression of TERMP_01135 coding for the second step of DIP synthesis. In contrast to other species, the T. barophilus synthesis operon is interrupted by a four gene locus, in reverse orientation. Restoring an operon like structure at the DIP locus restored DIP synthesis, but did not have an impact on growth characteristics, suggesting that...
Tipo: Text
Palavras-chave: High hydrostatic pressure; Heat stress; Di-myo-inositol-phosphate; Thermococcus barophilus.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00270/38113/37216.pdf

Exposure to solar radiation drives organismal vulnerability to climate: evidence from an intertidal limpet
Provedor de dados: 5
Autores: Chapperon, Coraline; Volkenborn, Nils; Clavier, Jacques; Seite, Sarah; Seabra, Rui; Lima, Fernando P.
Understanding the physiological abilities of organisms to cope with heat stress is critical for predictions of species’ distributions in response to climate change. We investigated physiological responses (respiration and heart beat rate) of the ectotherm limpet Patella vulgata to heat stress events during emersion and the role of seasonal and microclimatic acclimatization for individual thermal tolerance limits. Individuals were collected from 5 microhabitats characterized by different exposure to solar radiation in the high intertidal zone of a semi-exposed rocky shore in winter and summer of 2014. Upper thermal tolerance limits (heat coma temperatures - HCTs, and heart rate Arrhenius break temperatures - ABTs) were determined for individuals from each...
Tipo: Text
Palavras-chave: Patella vulgata; Heat stress; Acclimatization; Thermal tolerance; Microhabitat; Intertidal.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00318/42939/42447.pdf

Thermal biology of the deep-sea vent annelied Paralvinella grasslei: in vivo studies
Provedor de dados: 5
Autores: Cottin, D; Ravaux, J; Leger, N; Halary, S; Toullec, J; Sarradin, Pierre-marie; Gaill, F; Shillito, B.
The annelid Paralvinella grasslei is a deep-sea vent endemic species that colonizes the wall of active chimneys. We report here the first data on its thermal biology based on in vivo experiments in pressurized aquaria. Our results demonstrate that P. grasslei survives a 30 min exposure at 30 degrees C, and suggest that the upper thermal limit of this species is slightly above this temperature. The first signs of stress were noticed at 30 C, such as a significant increase in the animal's activity and the expression of HSP70 stress proteins. A preliminary investigation of the kinetics of stress protein expression surprisingly showed high levels of HSP70 proteins as late as 3.5 h after the heat shock. Finally, we provide here the first sequences for vent...
Tipo: Text
Palavras-chave: IPOCAMP; Annelids; Heat stress; Stress response; Heat shock proteins; Hydrothermal vents.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4570.pdf

The Seagrass Methylome Is Associated With Variation in Photosynthetic Performance Among Clonal Shoots
Provedor de dados: 5
Autores: Jueterbock, Alexander; Boström, Christoffer; Coyer, James A.; Olsen, Jeanine L.; Kopp, Martina; Dhanasiri, Anusha K. S.; Smolina, Irina; Arnaud-haond, Sophie; Van De Peer, Yves; Hoarau, Galice.
Evolutionary theory predicts that clonal organisms are more susceptible to extinction than sexually reproducing organisms, due to low genetic variation and slow rates of evolution. In agreement, conservation management considers genetic variation as the ultimate measure of a population’s ability to survive over time. However, clonal plants are among the oldest living organisms on our planet. Here, we test the hypothesis that clonal seagrass meadows display epigenetic variation that complements genetic variation as a source of phenotypic variation. In a clonal meadow of the seagrass Zostera marina, we characterized DNA methylation among 42 shoots. We also sequenced the whole genome of 10 shoots to correlate methylation patterns with photosynthetic...
Tipo: Text
Palavras-chave: DNA methylation; Ecological epigenetics; Clonality; Heat stress; Seagrass; Zostera marina(eelgrass).
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00652/76375/77363.pdf

Conception rate of artificially inseminated Holstein cows affected by cloudy vaginal mucus, under intense heat conditions
Provedor de dados: 86
Autores: Mellado,Miguel; Lara,Laura Maricela; Veliz,Francisco Gerardo; Santiago,María Ángeles de; Avendaño-Reyes,Leonel; Meza-Herrera,Cesar; Garcia,José Eduardo.
The objective of this work was to obtain prevalence estimates of cloudy vaginal mucus in artificially inseminated Holstein cows raised under intense heat, in order to assess the effect of meteorological conditions on its occurrence during estrus and to determine its effect on conception rate. In a first study, an association was established between the occurrence of cloudy vaginal mucus during estrus and the conception rate of inseminated cows (18,620 services), raised under intense heat (mean annual temperature of 22°C), at highly technified farms, in the arid region of northern Mexico. In a second study, data from these large dairy operations were used to assess the effect of meteorological conditions throughout the year on the occurrence of cloudy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy cattle; Heat stress; Reproductive efficiency; Seasonal pattern; Subclinical endometritis; Uterine infection.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000600492

Behavior of Japanese quail in different air velocities and air temperatures
Provedor de dados: 86
Autores: Santos,Tatiany Carvalho dos; Gates,Richard Stephen; Tinôco,Ilda de Fátima Ferreira; Zolnier,Sérgio; Baêta,Fernando da Costa.
Abstract: The objective of this work was to evaluate the combined effects of air temperature and air velocity on the behavior of Japanese quail (Coturnix coturnix japonica). A total of 216 Japanese quail in their initial laying phase were used. Bird behavior was categorized with an ethogram (eat, drink, stop, open wings/shiver, others). The experimental design was a randomized complete block, in a 4x4 factorial arrangement, with four air velocities (0, 1, 2, and 3 m s-1) and air temperatures (17, 23, 29, and 35°C). The behavior “stop” was greater when the birds were subjected to 17°C. At 35°C, a significant reduction (p&lt;0.05) was observed in the behavior “eat” at 0 m s-1, compared with the other velocities. The behaviors of laying quail are similar in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coturnix coturnix japonica; Cold stress; Ethology; Heat stress; Thermal sensation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000500344

Broiler breeder behavior and egg production as function of environmental temperature
Provedor de dados: 89
Autores: Pereira,DF; Nääs,IA; Romanini,CEB; Salgado,DD; Pereira,GOT.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler breeder; Heat stress; Behavioral pattern.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000100002

Effects of vitamin C and E dietary supplementation on erythrocyte parameters of layer chickens reared in high ambient temperature and humidity
Provedor de dados: 89
Autores: Ajakaiye,JJ; Pérez-Bello,A; Cuesta-Mazorra,M; García-Díaz,JR; Mollineda-Trujillo,Á.
A 30-day experiment involving 720 White Leghorn (L33) layer chickens of 39 weeks of age and average live weight of 1.8 ± 0.04 kg was carried out in a completely randomized design to evaluate the effects of vitamins C and E on erythrocyte parameters of layers during natural summer conditions. Birds were allotted to 4 treatments containing 0, 150 mg vitamin C, 150 mg vitamin E, and 150 mg vitamin C plus 150 mg vitamin E/kg feed. Each treatment was replicated four times. The exposure of layers to 31±3 °C and 33±0 °C ambient temperature and 84.6% and 81.5% relative humidity, inside and outside the experimental pen, during the study period caused an increase in temperature humidity index 15.5 above the threshold value of 70 established for this species. Total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Erythrocyte index; Heat stress; Hematocrit; Hemoglobin.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2010000300010

Brain and hepatic Hsp70 protein levels in heat-acclimated broiler chickens during heat stress
Provedor de dados: 89
Autores: Guerreiro,EN; Giachetto,PF; Givisiez,PEN; Ferro,JA; Ferro,MIT; Gabriel,JE; Furlan,RL; Macari,M.
In the present study we have investigated the effects of heat acclimation on brain and hepatic Hsp70 protein levels and body temperature of broiler chickens in response to gradual heat stress. Two groups of broilers were raised up to 47 days of age under distinct temperature conditions: thermoneutral (TN, according to bird age) or hot environmental (HS, 31-33°C). At 46 days of age, the birds reared at high ambient temperature were transferred to thermoneutrality conditions. After 18 h, these birds and the birds reared at thermoneutral temperature were submitted to gradual heat stress in a climatic chamber so that environment temperature was increased from 28 to 40ºC at a rate of 2ºC/h. Colonic temperature was measured using a thermometer sensor probe at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acclimation; Broiler chickens; Heat shock protein; Heat stress.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2004000400002

Artemisia Annua as Phytogenic Feed Additive in the Diet of Broilers (14-35 Days) Reared under Heat Stress (32 ºC)
Provedor de dados: 89
Autores: Saracila,M; Criste,RD; Panaite,TD; Vlaicu,PA; Tabuc,C; Turcu,RP; Olteanu,M.
ABSTRACT The 21 days feeding trial was conducted on 90, Cobb 500 broilers (aged 14 days), assigned to 3 groups (C, E1 and E2) housed in an experimental hall at 32° C constant temperature and 23 h light regimen. During the growth period (14-35 days), the conventional diet (C) had corn and soybean meal as basic ingredients. Unlike the conventional diet formulation (C), the diet formulations for the experimental groups also included 0.005% Artemisia annua oil (E1) and 0.005% Artemisia annua oil plus 1% Artemisia annua powder (E2). Six broilers per group were slaughtered at 35 days of age in order to measure the weight of the carcass and internal organs of broilers, and samples of intestinal and caecal content were collected for bacteriological assessment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artemisia annua; Broiler chickens; Growth performance; Gut microbiota; Heat stress.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000400825

Effect of Dietary Inclusion of Sodium Bicarbonate on Digestibility of Nutrients and Immune Response in Caged Layers During the Summer
Provedor de dados: 89
Autores: Abbas,G; Ahmad,F; Saeed,M; Ayasan,T; Mahmood,A; Yasmeen,R; Kamboh,A.
ABSTRACT The aim of this project was to investigate the effect of dietary inclusion of sodium bicarbonate (NaHCO3) on nutrient digestibility and immune response of caged layers during summer when the temperature exceeds 40 ˚C. For immune response trial, White Leghorn layers (n=160; 24 weeks old) were purchased from a poultry farm and were divided into five treatment/diets groups (4 replicate/treatment). Diet A, was without NaHCO3 and served as control whereas, diets B, C, D, and E contained 0.5, 1.0, 1.5 and 2.0% NaHCO3, respectively. All these birds were vaccinated against Newcastle disease (ND) virus at the start of the experiment and thereafter with one-month intervals. Blood samples were collected from two birds/replicate at 10 days post vaccination...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Layers; Newcastle disease; Nutrient digestibility; Sodium bicarbonate.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000200339

Arthrospira (Spirulina) Platensis Can Be Considered as a Probiotic Alternative to Reduce Heat Stress in Laying Japanese Quails
Provedor de dados: 89
Autores: Hajati,H; Zaghari,M; Oliveira,HC.
ABSTRACT This study was conducted to investigate the effects of Arthrospira platensis (Spirulina platensis, SP) on feed intake, feed conversion ratio, egg weight, hen day egg production, intestinal microflora, heat stress biomarkers, and HSP70 gene expression in laying Japanese quails (Coturnix coturnix japonica) suffering heat stress condition. A total of 250 female quails were allocated to 5 treatments, 5 replicates and 10 birds in each replicate in a completely randomized design. Experimental treatments included: 1) basal diet, 2) basal diet+ 0.03 % probiotic, 3) basal diet+ 0.1 % SP, 4) basal diet+ 0.3 % SP, 5) basal diet+ 0.5 % SP. During the last 6 days of the experiment, the quails were exposed to 8h of 34±1°C. The birds had free access to feed and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg production; Heat stress; HSP70 gene; Japanese quails; Spirulina platensis.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000100307

The Effect of High Temperature on Viability, Proliferation, Apoptosis and Anti-oxidant Status of Chicken Embryonic Fibroblast Cells
Provedor de dados: 89
Autores: Ibtisham,F; Zhao,Y; Nawab,A; Liguang,H; Wu,J; Xiao,M; Zhao,Z; An,L.
ABSTRACT The effects of oxidative stress induced by high temperature on the cell viability, proliferation, apoptosis and oxidative status of chicken embryonic fibroblasts (CEF) were analyzed. The viability, proliferation, apoptotic and anti-oxidative status were measured after incubating CEF at the temperatures of 37ºC (control) and 40-44ºC (experimental groups) for 6,12 and 24 hours. The results showed that at high temperature (42-43ºC), the viability of CEF cells decreased after 6, 12 and 24 h of incubation, but the difference was significant only at 43ºC. Cell proliferation was significantly reduced at 44oC/6h. The apoptotic rate of CEF cells was increased following heat treatments in a time-dependent manner. ROS formation increased with increasing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apoptosis; Chicken embryonic fibroblast; Cell proliferation; Heat stress; Oxidative stress.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000300463

Supplementation of Natural Antioxidants to Reduced Crude Protein Diets for Japanese Quails Exposed to Heat Stress
Provedor de dados: 89
Autores: Şenay,S; Islim,P; Tugay,A.
ABSTRACT The study aimed at comparing the effects of the supplementation of natural antioxidant sources to a reduced crude protein diet on the performance, carcass traits, blood parameters, liver antioxidant enzyme activities and meat lipid peroxidation of Japanese quails exposed to heat stress. A total of 640 14-day-old male Japanese quails were exposed to two different temperature treatments (TT): thermoneutral (TN) or heat stress (HS)and were fed five different dietary treatments (DTs). A normal-protein diet (SCP) was formulated according to the National Research Council (24% CP). The reduced crude protein diet (RCP) was formulated to contain 3% less protein than that of the SCP diet. Three additional diets were prepared by supplementing the RCP with200...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant enzymes; Heat stress; Lipid peroxidation; Natural antioxidants; Quails; Performance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000100303

Ascorbic acid and citric flavonoids for broilers under heat stress: effects on performance and meat quality
Provedor de dados: 89
Autores: Peña,JEM; Vieira,SL; López,J; Reis,RN; Barros,R; Furtado,FVF; Silva,PX.
The aim of this study was to evaluate the effects of increasing doses of ascorbic acid (AA) and citric flavonoids (quercetin and rutin) on the performance and meat quality characteristics of broilers submitted to cyclic heat stress. Four-hundred one-day-old female Ross 308 were housed in 40 battery cages a in temperature controlled room. Treatments consisted of 0, 250, 500, and 1000 g/ton on of AA + citric flavonoids. Birds were fed ad libitum until 32 day of age. Beginning on day 14 post-hatch until the end of the experiment, in order to simulate cyclic heat stress, the temperature inside the room was increased to 32°C for 5 hours, and decreased until reaching the comfort temperature corresponding to the age of the animals. Birds were slaughtered at 33...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascorbic acid; Broiler; Heat stress; Flavonoids.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2008000200008

Influence of Dietary Energy Level on Hepatic70-kDa Heat Shock Protein Expression in Broiler Chickens Submitted to Acute Heat Stress
Provedor de dados: 89
Autores: Gabriel,JE; Ferro,MIT; Ferro,JA; Silva,MM; Givisiez,PEN; Macari,M.
This experiment was carried out to study the effect of dietary energy on the colonic temperature and hepatic Hsp70 content in broiler chicken at room temperature and after heat stress conditions. Broiler chickens were reared up to 51 days of life, and fed diets containing high (HE -13,186 kJ ME/kg) or low (LE -12,139 kJ ME/kg) energy. At 21 and 51 days of age, the colonic temperature was measured at room temperature and liver samples were obtained for Hsp70 quantification by Western blotting analysis. It was also investigated at these ages the time course response of colonic temperature and hepatic Hsp70 level during heat stress (35º C/5 h). The data showed that at early age, at room temperature, colonic temperature or hepatic Hsp70 levels were not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler chicken; Dietary energy level; Heat shock protein; Heat stress.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2000000300008

Influence of environmental temperature and electrolyte balance on the performance of quails (Coturnix Coturnix Coturnix)
Provedor de dados: 89
Autores: Barbosa Lima,R; Silva,JHV da; Givisiez,PEN; Martins,TDD; Saraiva,EP; Costa,FGP; Macari,M.
High environmental temperatures have a negative effect on the production efficiency of poultry reared in hot climates. This study evaluated the efficiency of electrolyte supplementation under high environmental temperature conditions by manipulating water and feed electrolyte balance (EB) on the survival and performance of European quails. In experiment 1, a completely randomized experimental design was applied in a 4 x 2 factorial arrangement. Treatments consisted in four feed EB values (0, 120, 240, 360 mEq/kg), and two environmental temperatures (25 and 34 ºC). Feed electrolyte balance was manipulated by the addition of sodium bicarbonate and ammonium chloride. In experiment 2, birds were randomly distributed according to a 5 x 2 factorial arrangement....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonium chloride; Heat stress; Sodium bicarbonate.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2014000300004

Effects of Gaba on the Thymus Cytokines of Wenchang Chickens Submitted to Heat Stress
Provedor de dados: 89
Autores: Xie,XZ; Liang,C; Li,MH; Chen,Z.
ABSTRACT Under routine feeding conditions, 1-day-old male chicks were randomly divided into control group (CK), heat-stress group (HS), and GABA + heat stress group (GABA+HS). The thymus contents of IL-1, IL-2, TGF-β1, IFN-γ, GH and HSP70 were determined by enzyme-linked immunosorbent assays. The results showed that: (1) IL-1 and TGF-β1 contents of HS group were significantly lower than those of the CK group (p&lt;0.05), and those of the GABA+HS group were significantly higher relative to the HS group (p&lt;0.05); (2) IL-2 and IFN-γ contents of the HS group were significantly higher than those of the CK group (p&lt;0.05), and those of the GABA+HS group were significantly lower relative to the HS group (p&lt;0.05);(3) the thymus GH content of all three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; GABA; Cytokines; Thymus; Chicks.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2017000100143

THE EFFECT OF CICHORIUM INTYBUS L. ETHANOL EXTRACTION ON THE PATHOLOGICAL AND BIOMEDICAL INDEXES OF THE LIVER AND KIDNEY OF BROILERS REARED UNDER HEAT STRESS
Provedor de dados: 89
Autores: Khodadadi,M; Mousavinasab,SS; Khamesipour,F; Katsande,S.
ABSTRACT The use of compounds with antioxidant properties as a source of phelanoeid compounds is highly recommendable in the poultry industry. Therefore, the effect of Cichorium intybus L. herb on pathobiochemical indexes of chicken under heat stress was studied. After exposure to heat stress (from day 21 to day 42 of growth), hydroalcoholic extraction was provided to 270 broiler chicks randomly divided into six groups and placed in two distinct poultry houses (heat stress and normal conditions). The three groups were recipient group of Cichorium intybus L. (1); recipient group of vitamin C (2) and control group (3). The birds in one of the houses were exposed to heat stress conditions (35 °C for 8 hours) for a time period between 22 to 42 days and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Cichorium intybus L; Vitamin C; Broiler chicks.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000300407

Effects of Heat Stress on the Development of GABAergic Neurons in the HPG Axis of Wenchang Chicks
Provedor de dados: 89
Autores: Liang,W; Lu,BB; Liang,C; Yu,ZQ; Xie,XZ; Chen,Z.
ABSTRACT This study conducted an in-depth investigation on the development of GABAergic neurons and their receptors in HPG axis-related target organs of Wenchang chicks under heat stress. One-day-old healthy Wenchang chicks were randomly divided into control (CK) and heat stress (HS) groups. Chicks in the HS group were placed in a 40±0.5°C climatic chamber for HS treatment from 13:00 to 15:00 daily. By immunohistochemistry and Western blotting, GABA and GABAA receptor (GABAAR) expression in the hypothalamus of the HS group was significantly higher (p&lt;0.05), but GABAB receptor (GABABR) expression was significantly lower than that of the CK group (p&lt;0.05). Expression of GABA and its two receptors in the pituitary tissues of the HS group was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; GABAergic neurons; HPG axis; Wenchang chick.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000200342

Taurine Reduces Heat Stress by Regulating the Expression of Heat Shock Proteins in Broilers Exposed to Chronic Heat
Provedor de dados: 89
Autores: Belal,SA; Kang,DR; Cho,ESR; Park,GH; Shim,KS.
ABSTRACT The aim of the current study was to investigate the effects of taurine on heat stress by evaluating them RNA and protein expressions of HSP90, 70 and 60in Ross broilers. Birds were distributed in a control group (CO) reared at 24ºC, a heat-stress group (HS) maintained at 34°C (weeks 3-5) and not supplemented with taurine, and a heat-stress group (HST) maintained at 34°C (weeks 3-5) and supplemented with 0.1% taurine from 2 weeks of age. The final body weight was significantly higher in the HST group than in the HS group (p&lt;0.05). The mRNA expression of all three genes in the liver and of HSP90 in the muscle were significantly lower in the HST than in the HS group (p&lt;0.05). In the liver, the expression of HSP70 and HSP60 proteins was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler; Taurine; Heat stress; Heat shock protein; Gene and protein expression.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000300479

Performance of layers submitted to different forced-molting methods and different temperatures
Provedor de dados: 89
Autores: Sgavioli,S; Filardi,R da S; Praes,MFFM; Assuena,V; Pileggi,J; Andrade,P de C; Boleli,I C; Junqueira,OM.
This study was carried out to evaluate the performance and egg quality of laying hens, in their second laying cycle submitted to different forced-molting methods and three environmental temperatures. Six hundred layers were distributed in a completely randomized experimental design with 15 treatments with five replicates of eight birds each, according to 5x3 factorial arrangement (molting methods vs. temperatures). The following forced-molting methods were applied: 90%, 70%, 50% dietary alfalfa inclusion, addition of 2,800 ppm zinc, and feed fasting. Temperatures were: 20 ºC, 27 ºC and 35 ºC. At the end of each period of the second laying cycle, bird performance and egg quality were evaluated. Data were submitted to analysis of variance and means were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg quality; Heat stress; Performance; Welfare.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2011000300008

Effect of Dietary Curcumin on the Antioxidant Status of Laying Hens under High-Temperature Conditions
Provedor de dados: 89
Autores: Nawab,A; Li,G; Liu,W; Lan,R; Wu,J; Zhao,Y; Kang,K; Kieser,B; Sun,C; Tang,S; Xiao,M; An,L.
ABSTRACT Heat stress induces oxidative stress, and reduces body antioxidant metabolite levels, which can affect poultry production performance. Dietary antioxidants protect birds against the adverse effects of heat stress. The effects of increasing concentrations of dietary curcumin on the antioxidant parameters of layers maintained under high-temperature conditions for nine weeks were evaluated. Roman laying hens (n = 336, 22 weeks old, 1420 g BW) were divided into three treatment groups. The first group served as a thermoneutral control (kept at 25 ± 1 °C). The second group was exposed to high temperatures (32 ± 1 °C, 6 h/d), given a basal diet. The third group was further divided into five treatment groups (100, 150, 200, 250, 300 mg/kg Curcumin) fed a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Curcumin; Heat stress; Laying hen; Oxidative damage.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000200337

Performance, Body Temperature and Egg Quality of Laying Hens Fed Vitamins D and C Under Three Environmental Temperatures
Provedor de dados: 89
Autores: Faria,DE; Junqueira,OM; Souza,PA; Titto,EAL.
Three experiments were conducted in a climatic chamber to determine the effects of vitamins D3 and C supplementation on performance, body temperature, and egg quality under thermoneutral temperature (24.8º to 27.0º C), a cyclic heat stress (26.2º C for 16 h and 32.1º C for 8 h) and a constant heat stress (30.0º to 32.0º C) for three weeks in each temperature. One hundred forty-four White Leghorn hens aged 31 weeks were used in a completely randomized design with a factorial arrangement of 3 x 3: vitamin D3 (2,500, 3,000, and 3,500 IU/kg) and vitamin C (0, 200, and 400 ppm), with a total of nine treatments with four replicates of four hens each. Parameters measured included feed intake (FI), feed:gain (FG), egg production (EP), egg weight (EW), egg mass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascorbic acid; Cholecalciferol; Egg; Heat stress; Laying hens.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2001000100005

Performance and egg quality of Japanese quails submitted to cyclic heat stress
Provedor de dados: 89
Autores: Vercese,F; Garcia,EA; Sartori,JR; Silva,A de P; Faitarone,ABG; Berto,DA; Molino,A de B; Pelícia,K.
Aiming at evaluating the influence of cyclic temperatures on the performance and egg quality of Japanese quails an experiment was carried out with 480 birds after egg production peak. Birds were housed in a bioclimatic chamber with automatic temperature control that contained two rooms, one maintained at thermoneutral temperature (21 ºC) and the other adjusted for the tested cyclic temperatures (24, 27, 30, 33 and 36 ºC at a time). Each room had a battery of five floors and ten cages, with a capacity of 24 birds per cage, totaling 240 birds per battery. Birds were fed iso-nutritious and iso-caloric diets. Data obtained under the tested cyclic temperatures were compared with those obtained under thermoneutral temperature. At the end of each experimental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coturnix coturnix japonica; Egg production; Environmental temperature; Heat stress; Post-peak egg production.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000100007

Effect of forced-molting methods and rearing temperatures on the performance and organ biometrics of laying hens
Provedor de dados: 89
Autores: Sgavioli,S; Filardi,R da S; Praes,M F F M; Domingues,C H de F; Andrade,P de C; Pileggi,J; Boleli,I C; Junqueira,O M.
An experiment was conducted to evaluate the biometrics of organs (ovary, oviduct, liver, proventriculus and gizzard) of laying hens submitted to different forced-molting methods of molt and maintained at three different temperature. Organs were evaluated after molting and resting period. Six hundred birds were distributed according to a completely randomized experimental design in a 5x3 factorial arrangement (forced-molting methods x environmental temperatures) into 15 treatments with 5 replicates of 8 birds each. The molting methods applied were the dietary inclusion of 90%, 70%, 50% of alfalfa, 2,800 ppm zinc oxide, or total feed restriction. Birds were kept at ±20 ºC, ±27 ºC, or ±35 ºC. Data were submitted to analysis of variance and means were compared...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Ovary; Feed restriction; Welfare.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000300011

Correlations among behavior, performance and environment in broiler breeders using multivariate analysis
Provedor de dados: 89
Autores: Pereira,DF; Nääs,A; Salgado,DA; Gaspar,CR; Bighi,CA; Penha,NLJ.
Animal welfare issues have received much attention not only to supply farmed animal requirements, but also to ethical and cultural public concerns. Daily collected information, as well as the systematic follow-up of production stages, produces important statistical data for production assessment and control, as well as for improvement possibilities. In this scenario, this research study analyzed behavioral, production, and environmental data using Main Component Multivariable Analysis, which correlated observed behaviors, recorded using video cameras and electronic identification, with performance parameters of female broiler breeders. The aim was to start building a system to support decision-making in broiler breeder housing, based on bird behavioral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal welfare; Behavior; Heat stress.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000400001

Effect of Fennel (Foeniculum Vulgare Mill.) Used as a Feed Additive on The Egg Quality of Laying Hens Under Heat Stress
Provedor de dados: 89
Autores: Gharaghani,H; Shariatmadari,F; Torshizi,MA.
In this study, one hundred and twenty 40-wk-old White Leghorn laying hens were submitted to two different thermal conditions (24° C vs. 34° C) and were fed three levels (0, 10, or and 20 g/kg of diet)of fennel fruits (Foeniculum vulgare Mill.) as a feed additive in. This study was carried out according to a factorial design consisting of two temperatures and three fennel levels with five 5 replicates each (n = 2 × 3 × 5). Performance, egg production, egg quality, and oxidative product levels (malondialdehyde, MDA, and carbonyl) in the eggs were measured before and after heat exposure. The results showed that the tested temperatures did not affect egg production (p&gt;0.05), but the production of eggs with broken shell and feed intake were affected by heat...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fennel; Heat stress; Laying hens; Antioxidant; Feed.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000200199

Does low-protein diet improve broiler performance under heat stress conditions?
Provedor de dados: 89
Autores: Furlan,RL; Faria Filho,DE de; Rosa,PS; Macari,M.
Nutrition for broilers under high temperatures is extremely important for brazilian broiler chicken industry because the amounts of consumed nutrients and environmental temperature have great effects on bird performance and carcass quality. Among diet nutrients, protein has the highest heat increment; thus, during many years, diets with low protein level were recommended in order to reduce heat production in broiler chickens under heat stress. However, reports have shown that low-protein diets have negative effects on broiler performance when environmental temperature is high, because during heat stress, low food intake associated to a low diet protein induce amino acid deficiencies. Other studies have shown that broilers fed low-protein diets increase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler chickens; Crude protein; Heat stress; Heat increment; Heat production.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2004000200001

The Effects of Different Amount of Protein and Vitamin e Supplementation in Rations on Lipid and Antioxidant Metabolism of Broilers Exposed to Heat Stress
Provedor de dados: 89
Autores: Erol,HS; Imik,H; Gumus,R; Halici,M.
ABSTRACT Heat stress, causes economic losses and has negative effects on both broiler husbandry and animal welfare. Nutritional strategies are applied for minimizing the negative effects of heat stress. In the present study, at the finishing period (24-39 days of age) of heat stress, the effects of diet involving 21% and 19% proteins and vitamin E on lipid metabolism and antioxidant mechanism of action, aimed to be identified. This study was carried out in six groups as: HPC (24oC heat + 21% crude protein (CP)), HPS (34oC heat + 21% CP), LPC (24oC heat + 19% CP), LPS (34oC heat + 19% CP), HPSVE (34oC heat + 21% CP + Vitamin E) and LPSVE (34oC heat + 19% CP + vitamin E) groups. Superficial pectoral muscles (breast) and liver tissues were used for oxidative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Broiler; Protein; Vitamin E; Oxidative stress.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2017000200289

Performance and carcass characteristics of broiler chickens with different growth potential and submitted to heat stress
Provedor de dados: 89
Autores: Rosa,PS; Faria Filho,DE; Dahlke,F; Vieira,BS; Macari,M; Furlan,RL.
In order to evaluate the effects of broiler genotype and of heat exposure on performance, carcass characteristics, and protein and fat accretion, six hundred one-day-old male broilers were randomly assigned in a 2 x 3 factorial arrangement, according to the following factors: genetic group (selected and non-selected broilers) and pair-feeding scheme (Ad32 - reared under heat stress and fed ad libitum; Ad23 - reared at thermoneutrality and fed ad libitum; Pf23 - reared at thermoneutrality and pair fed with Ad32), with a total of six treatments with four replicates of 25 birds each. Independent of pair-feeding scheme, selected broilers showed better feed conversion, higher carcass yield, and lower abdominal fat deposition rate. However, as compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometric coefficient; Carcass yield; Genetic improvement; Heat stress.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000300007

GLUTAMIC ACID IMPROVES BODY WEIGHT GAIN AND INTESTINAL MORPHOLOGY OF BROILER CHICKENS SUBMITTED TO HEAT STRESS
Provedor de dados: 89
Autores: Porto,ML; Givisiez,PEN; Saraiva,EP; Costa,FGP; Moreira Filho,ALB; Andrade,MFS; Brandão,PA; Guerra,RR.
ABSTRACTThe objective of this study was to evaluate the effects of 1% dietary glutamic acid on the body weight, intestinal morphometry, and anti-Newcastle antibody titers of broiler chickens submitted to heat stress. One-d-old male broiler chicks (n=120) were distributed according to a 2 x 2 factorial design with two environmental temperatures (thermoneutral or heat stress) and two diets (with 0 or 1% glutamic acid). Heat stress temperature was constantly maintained (24h/day) 5 ºC higher than the thermoneutral temperature. Diets supplied the nutritional requirements of broilers in the pre-starter (1 to 7d) and starter (8 to 21d) phases. Birds were vaccinated against Newcastle disease on d 7 via eye drop. On days 5, 10, 15, and 20, individual body weight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino acid; Duodenum morphology; Environmental temperature; Humoral immunity; Heat stress; Performance.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000300355

Effects of Heat Stress on the Daily Behavior of Wenchang Chickens
Provedor de dados: 89
Autores: Li,M; Wu,J; Chen,Z.
ABSTRACT One-day old chicks were randomly distributed into acute heat stress (AHS) or persistent heat stress (PHS) groups. Each group was further divided into control (CK), and three AHS ages (1, 2,or 3 weeks of age) experimental subgroups. The chicks in AHS subgroups were submitted to acute heat stress (40oC for two hours between 12:00 and 14:00 hours during the weekend) and the effects of heat stress on several daily behaviors were observed. At 8 days of age, the chicks of PHS subgroups were submitted to heat stress (40oC daily). The heat treatment ceased during the weekends and the effects on the behavior were observed three times daily for three consecutive days. The results showed that, compared with the CK group, the duration and frequency of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Broiler behavior; Behavioral observations; Wenchang chicken.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000400559

Variation in available shaded area changes behaviour parameters in grazing dairy cows during the warm season
Provedor de dados: 96
Autores: Stivanin,Sheila Cristina Bosco; Werncke,Daíse; Vizzotto,Elissa Forgiarini; Stumpf,Marcelo Tempel; Thaler Neto,André; Fischer,Vivian.
ABSTRACT The objective was to investigate the effects of available shaded area on behavioural characteristics of lactating cows during the warm season in the subtropics. Twelve Holstein cows were divided into groups, with 2 (SH2) or 10 m2 (SH10) of available shade per cow (six cows per treatment). The behaviour was recorded when animals were grazing from 09.00 to 16.00 h (GMT −02.00 h) throughout the trial. Data considered in the statistical analysis were restricted to the five days when the maximum temperature was ≥ 25 °C. Cows in the SH10 group had lower panting score, but higher proportions of time in shade and lying down and stayed more time per visit in the shaded area than cows in the SH2 group. Cows in the SH10 group had less events of competition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal welfare; Behaviour; Dairy cows; Heat stress; Lactation; Shade.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100202

Physiological and biochemical response to Omega-3 plus as a dietary supplement to growing goats under hot summer conditions
Provedor de dados: 96
Autores: Teama,Fatma Edrees Ibrahim; El-Tarabany,Akram A.
ABSTRACT The objective of the present study was to assess the effect of dietary supplementation of Omega-3 plus on some the physiological and biochemical traits in growing Baladi goats under hot summer conditions. Thirty-four growing male goats (4-5 months old) were randomly divided into two equal groups. Animals in group 1 were fed a concentrate feed mixture (CFM), which was the control group. Goats in group 2 (the experimental group) were offered Omega-3 plus (1,000 mg/animal day-1) (30% fish oil, containing 18% eicosapentaenoic acid and 12% docosahexaenoic acid + 100 mg wheat germ oil (0.22% tocopherols)) daily in addition to the basal diet for four months (the experimental period) during the hot summer season. Body weight (BW) changes of both groups...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cholesterol; Heat stress; IgG; Liver enzymes; T3; T4.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000400174

Dietary crude protein reduction on growth and carcass performance of 22 to 42-day-old broilers reared under different temperatures
Provedor de dados: 96
Autores: Oliveira,Will Pereira de; Oliveira,Rita Flávia Miranda de; Donzele,Juarez Lopes; Oliveira Neto,Adhemar Rodrigues de; Gomes,Paulo Cezar; Maia,Ana Paula de Assis; Campos,Paulo Henrique Reis Furtado; Gasparino,Eliane.
This study was conducted to verify the effects of dietary crude protein reduction on growth and carcass performance of 22-42-day-old broilers reared under different temperatures. Treatments were set up in a five by two factorial arrangement, with five crude protein levels (220, 210, 200, 190 and 184 g/kg) and two temperatures (21.6 and 32.2 ºC). Diets were isocaloric and essential amino acid-to-lysine ratio was maintained constant in all treatments. There was no interaction between crude protein reduction and environmental temperature for any of the parameters evaluated. Crude protein had no influence on feed intake. Nevertheless, weight gain and feed conversion ratio were linearly influenced by crude protein reduction. Worse performance was also observed...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Breast yield; Heat stress; Temperature; Thermoneutral temperature.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000800010

Yeast extract and prebiotic in pre-initial phase diet for broiler chickens raised under different temperatures
Provedor de dados: 96
Autores: Silva,Vanessa Karla; Silva,Janaina Della Torre da; Gravena,Rodrigo Antonio; Marques,Rafael Henrique; Hada,Fabricio Hirota; Moraes,Vera Maria Barbosa de.
The objective of this research was to evaluate the performance, carcass yield and intestinal morphometry of broiler chickens raised under different temperatures that received feed with or without yeast extract and prebiotic in the pre-initial phase. One thousand four hundred and forty one-day old male chicks were used, raised in different climate chambers. Feed with or without the addition of yeast extract and prebiotic was offered only in the pre-initial phase (1 to 7 days). From the eighth day on, every chick received the same feed, readjusted according to usual recommendations. A randomized complete experimental design was used in a 3 × 2 × 2 factorial arrangement, consisting of three environmental temperatures (hot, comfort and cold) and two levels of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass yield; Heat stress; Intestinal morphometry; Mannanoligosaccharides; Performance; Saccharomyces cervisiae.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000100022

Additional feeding during late gestation improves initial litter weight of lactating sows exposed to high ambient temperature
Provedor de dados: 96
Autores: Choi,Yo Han; Hosseindoust,Abdolreza; Kim,Min Ju; Kim,Kwang Yeol; Lee,Jun Hyung; Kim,Young Hwa; Kim,Jin Soo; Chae,Byung Jo.
ABSTRACT The present study investigated the impacts of additional feeding (AF; containing 16% excess feed than control diet in the last two weeks of gestation) during late gestation period and different backfat thickness (BFT) including low (&lt;20 mm) and high (≥20 mm) backfat on reproductive performance, litter size, blood metabolites, hormonal profiles, colostrum, and milk composition of sows from day 90 of gestation to farrowing, and from farrowing to weaning during summer (average 28.3 °C). Fifty-four crossbred sows (Yorkshire × Landrace) were allotted to one of four treatments according to a 2×2 factorial arrangement. There was no AF×BFT interaction for any of the measured variables. The body weight change of sows was decreased for &lt;20 mm in BFT...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Backfat thickness; Gestating sows; Heat stress; Reproductive traits.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100522

Effects of dietary grape seed on performance and some metabolic assessments in Japanese quail with different plumage colors exposed to heat stress
Provedor de dados: 96
Autores: Erişir,Zeki; Şimşek,Ülkü Gülcihan; Özçelik,Mehtap; Baykalır,Yasin; Mutlu,Seda İflazoğlu; Çiftçi,Mehmet.
ABSTRACT The objective of this study was to determine the effects of grape seed (GS) supplementation to basal diet on performance, carcass characteristics, some biochemical parameters, and antioxidant status of tissues of Japanese quail in growth phase with different plumage colors exposed to heat stress (HS). A total of 144 eight-day-old Japanese quail including 72 (36 females, 36 males) grey and 72 (36 females, 36 males) golden were used in this study. The quail were kept under HS (16 h at 34 °C, 8h at 22 °C) and thermo-neutral (24 h at 22°C) conditions between 15 and 43 days of age. All quail were fed a basal diet (control) and basal diet supplemented with GS at both 10 g/kg and 20 g/kg ratios. Each feeding treatment was repeated three times including...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Feed additive; Heat stress; Japanese quail.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100201

Microclimate in silvipastoral systems with eucalyptus in rank with different heights
Provedor de dados: 96
Autores: Souza,Wander de; Barbosa,Orlando Rus; Marques,Jair de Araújo; Costa,Marco Aurélio Teixeira; Gasparino,Eliane; Limberger,Erni.
The aim of this work was to verify if the presence of trees and its height in formed silvipastoral systems with eucalyptus planted in rank can modify the microclimate and improve the environment for bovine raising during the day in summer. It was evaluated the microclimate of the environment in formed silvipastoral systems in rank of eucalyptus with 8 m, 18 m and 28 meters of height, compared to a system no shade in the summer. The experimental design was a split plot with six hour time in sub parcels. The systems are made up of parcels and the months as block in four replications and the interaction hour × system. The air temperature, black globe temperature, relative humidity and wind speed were observed to create the following indexes for thermal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ambient; Heat stress; Index; Shade; Thermal comfort; Trees.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000300030

Growth performance, intestinal morphology, and meat quality in relation to alpha-lipoic acid associated with vitamin C and E in broiler chickens under tropical conditions
Provedor de dados: 96
Autores: Yoo,Jaehong; Yi,Young Joo; Koo,Bonjin; Jung,Samooel; Yoon,Joung Ung; Kang,Hyun Bae; Lee,Do Hun; Heo,Jung Min.
ABSTRACT This study was conducted to examine the effect of alpha-lipoic acid with vitamin C and E on growth performance, intestinal morphology, and meat quality in broiler chickens under tropical conditions. A total of 288 one-day-old male ROSS 308 chicks (40±0.1 g) were used in a completely randomized design and allotted to one of six dietary treatments to form sixe replicates per treatment (eight birds per cage). The six dietary treatments were: a corn-soybean meal-based diet (NC; no antimicrobial compounds added) with 8 ppm alpha-lipoic acid (ALA); 150 ppm vitamin C and 75 ppm vitamin E (E-75); E-75 plus ALA (E-75-ALA); 150 ppm vitamin C and 50 ppm vitamin E (E-50) plus ALA (E-50-ALA); and 150 ppm vitamin C and 25 ppm vitamin E (E-25) plus ALA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broilers; Heat stress; Vitamin E; Tropical condition.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000300113

Changes in ruminal fermentation and mineral serum level in animals kept in high temperature environments
Provedor de dados: 96
Autores: Salles,Márcia Saladini Vieira; Zanetti,Marcus Antonio; Salles,Fernando André; Titto,Evaldo Antonio Lencioni; Conti,Renata Maria Consentino.
In order to evaluate the effect of environmental temperature on ruminal fermentation and on mineral levels of growing ruminants, it was used 12 male calves (initial average weight 82.9 ± 7.7 kg, 100 days of age), were employed in a randomized block design (by weight) experiment, with repeated weight measurement and two environmental temperatures: thermoneutral (24ºC) and heat-stressed (33ºC), during 38 days. The animals exposed to 33ºC presented lower dry matter ingestion, lower T3 (triiodothyronine) serum level, higher ammoniacal nitrogen (NH3-N) level in the rumen liquid, and higher rectal and body temperatures during all the experimental period when compared to the animals kept in thermoneutral environment (24ºC). The animals kept under heat stress...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammoniacal nitrogen; Dry matter ingestion; Heat stress; Macromineral; Micromineral; Volatile fatty acids.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400025

Physiological responses of growing pigs to high ambient temperature and/or inflammatory challenges
Provedor de dados: 96
Autores: Campos,Paulo Henrique Reis Furtado; Le Floc'h,Nathalie; Noblet,Jean; Renaudeau,David.
ABSTRACT Global warming is one of the major environmental threats facing the world in the 21st century. This fact will have a significant impact on pig production due to its direct effects on welfare, health, and performance of pigs. Besides, the effects of high temperatures will presumably become more important over the next decades due to the development of pig production in developing countries mainly located in tropical and subtropical areas, where animals are often exposed to ambient temperatures above their thermal comfort zone. Furthermore, pigs reared in tropical areas are often confronted to sanitary challenges including poor hygiene conditions, lack of respect for sanitary rules, and pathogens. This results in the stimulation of the immune system...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal biometereology; Heat stress; Metabolism; Physiology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000600537

Effect of THI on milk coagulation properties of Holstein-Friesian dairy cattle
Provedor de dados: 96
Autores: Beux,Simone; Cassandro,Martino; Nogueira,Alessandro; Waszczynskyj,Nina.
ABSTRACT The objective of this study was to evaluate the effect of temperature-humidity index (THI) on the milk coagulation properties of Holstein-Friesian dairy cattle from northeast part of Italy. A total of 592 individual milk samples from six dairy herds were evaluated. The milk coagulation properties traits analysed were milk rennet coagulation time and curd firmness, as well as the fat, protein, and casein contents, pH, milk aptitude to coagulate (IAC), and the somatic cell count. The THI was determined during the periods of sample collection. The THI results showed that values of up to 75 did not significantly change the IAC values; however, when the THI values were above 75, the IAC decreased significantly. The control of THI can be used to...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Clotting; Curd firmness; Dairy cow; Heat stress.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000500429

Available phosphorus levels in diets supplemented with phytase for male broilers aged 22 to 42 days kept in a high-temperature environment
Provedor de dados: 96
Autores: Tizziani,Tarciso; Donzele,Rita Flávia Miranda de Oliveira; Donzele,Juarez Lopes; Balbino,Eric Márcio; Silva,Amanda Dione; Figueiredo,Érika Martins de; Muniz,Jorge Cunha Lima; Jacob,Rodrigo de Freitas.
ABSTRACT This study was conducted to evaluate the effect of reduction of the available phosphorus (avP) in diets supplemented with 500 FTU/kg phytase on performance, carcass characteristics, and bone mineralization of broilers aged 22 to 42 days kept in a high-temperature environment. A total of 336 Cobb broilers with an average initial weight of 0.883±0.005 kg were distributed in a completely randomized design with six treatments - a positive control (0.354 and 0.309% avP without addition of bacterial phytase for the phases of 22 to 33 and 34 to 42 days, respectively), and another five diets with inclusion of phytase (500 FTU) and reduction of the level of avP (0.354, 0.294, 0.233, 0.173, and 0.112%; and 0.309, 0.258, 0.207, 0.156, and 0.106% for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone mineralization; Carcass characteristics; Heat stress; Performance; Thermal environment.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000200048

Influence of high temperature on the reproductive biology of dry edible bean (Phaseolus vulgaris L.)
Provedor de dados: 63
Autores: Silva,Daiana Alves da; Pinto-Maglio,Cecília Alzira Ferreira; Oliveira,Érica Cristina de; Reis,Raquel Luiza de Moura dos; Carbonell,Sérgio Augusto Morais; Chiorato,Alisson Fernando.
ABSTRACT: The aim of this study was to investigate the effect of heat stress on 12 bean genotypes through the analysis of their reproductive biology in terms of flowering, pollen viability, meiotic behavior, and production. Plants were grown in a climate chamber at 25-20 °C (day and night) and at a high temperature treatment 37-26 °C (day and night) from the vegetative (V4) development stage to physiological maturity. The experimental design was 2 × 12 factorial arrangement with six replications and the factors consisted of heat treatments and genotypes. In three replications, the number of newly opened flowers was checked daily. At physiological maturity, the following traits were evaluated: percentage of pod set, number of pods, number of viable seeds,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Common bean; Heat stress; Pollen viability; Meiosis; Seed yield.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000301100

Empirical models to predict feed intake of growing-finishing pigs reared under high environmental temperatures
Provedor de dados: 63
Autores: Perondi,Dani; Kipper,Marcos; Andretta,Ines; Hauschild,Luciano; Lunedo,Raquel; Franceschina,Carolina Schell; Remus,Aline.
ABSTRACT Several empirical models were proposed to predict feed intake (FI) of growingfinishing pigs reared under high environmental temperatures. However, these models have not been evaluated under conditions different from those in which they were developed. Twelve empirical models were evaluated using a database built after systematic literature review (observed data: 28 studies in which the FI was evaluated in pigs under high environmental temperatures). Model accuracy was assessed using the mean squared of prediction error (MSPE). Analyses were performed considering two scenarios: (1) general population, where all observed data were used in the simulation; (2) reference population, where data were filtered in order to simulate only scenarios with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Consumption; Heat stress; Modelling; Precision feeding; Swine.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400296

Sarcoplasmatic and myofibrillar protein changes caused by acute heat stress in broiler chicken
Provedor de dados: 63
Autores: Santos,Carolina de Castro; Delgado,Eduardo Francisquine; Menten,José Fernando Machado; Pedreira,Aparecida Carla de Moura; Castillo,Carmen Josefina Contreras; Mourão,Gérson Barreto; Brossi,Camila; Silva,Iran José Oliveira da.
Acute heat stress (AHS) modifies the structure of myofibrils affecting functional properties of meat, mainly the water holding capacity. This experiment aimed to identify changes in proteolysis and migration between the myofibrillar and sarcoplasmatic fractions due to pre-slaughter AHS. Myofibrillar fragmentation index (MFI), SDS-PAGE, western blot of vinculin (WB) and shear force (SF) were determined. Six hundred broilers (Gallus gallus) were slaughtered in three different days (ST). In each ST, groups of ten animals were placed in transport crates and submitted to AHS (35ºC, 75 - 85% RH) for 2 hours. Simultaneously, the non-stressed broilers (NS) were kept in thermoneutral environment (22ºC, 83 ± 6.6% RH) within the crates in the same density. After...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler; Heat stress; Lightness; Fragmentation index; Shear force.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500002

Spatial analysis of stress conditions inside broiler house under tunnel ventilation
Provedor de dados: 63
Autores: Miragliotta,Miwa Yamamoto; Nääs,Irenilza de Alencar; Manzione,Rodrigo Lilla; Nascimento,Fernando Ferraz do.
Broiler building typology associated with the local characteristics (climate, topography and surrounding vegetation) and handling systems (stocking density, curtains, equipment and nutrition) influence the inside environment. A spatial distribution analysis of these conditions may indicate stress zones in the house. The aim of this research was to apply spatial analysis of thermal, aerial and acoustic environmental conditions inside a tunnel ventilated broiler housing, with a stocking density of 18 birds m-2. This study was carried out in Rio Claro, SP, Brazil, in a 12 m × 115 m house divided into three equal sections (East, center and West), East-West oriented, and virtually divided on 132 cells, each one measuring 3.0 m × 3.5 m. At the geometric center...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler production; Environment; Geostatistics; Heat stress; Spatial distribution.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500002

ผลของบราสสิโนสเตียรอยด์ต่อการสังเคราะห์ด้วยแสงและผลผลิตของข้าวพันธุ์ปทุมธานี 1 ภายใต้ภาวะเครียดจากความร้อน
Provedor de dados: 106
Autores: Kanapol Juthamanee; Jutiporn Thassakulpanit; Verasilp Sornsomboon; Lilly Kaweeta; Vitit Jaiaree; Apichart Sooksamrarn.
Brassinosteroids are the plant hormone reported to alleviate heat stress. This study investigated the response of rice (Oryza sativa L.cv. Pathum Thani 1) to 24-epibrassinolide (EBR) or 7,8-dihydro-8-20-hydroxyecdysone (DHECD) under high temperature by examine photosynthesis performance and yield. The results show that foliar application of 0.01 μM EBR and 0.1 μM DHECD on V7 vegetative growth could increase the photosynthetic efficiency under 40/30 ºC (day/night temperature). In field growth experiment, the application of those brassinosteroids concentrations on V7 growth stage could increase seed setting in all panicle part and number of normal seeds per particle. The results indicated that EBR and DHECD alleviated heat stress of rice ‘Pathum Thani 1’ by...
Tipo: Collection
Palavras-chave: Rice; Photosynthesis; Brassinosteroids; Yield; Heat stress; ข้าว; การสังเคราะห์แสง; ผลผลิต; บราสสิโนสเตียรอยด์; ความเครียดจากความร้อน; ฮอร์โมนพืช; การตอบสนองของพืช; การติดเมล็ด; พันธุ์ปทุมธานี 1.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5326

การตอบสนองทางสรีรวิทยาต่อความเครียดเนื่องจากความร้อนในโคนมที่มีจีโนไทป์ที่แตกต่างกันของยีน HSP70-2
Provedor de dados: 106
Autores: Tatsaporn Siripug; Suporn Katawatin.
HSP70-2 is well accepted as an indicator of heat stress. The purpose of this study was to investigate the physiological responses to heat stress of differential genotypes of HSP70-2 in dairy cattle. Thirty two female Holstein Friesian (HF) crossbred heifers, 2-3 years of age, 266 ± 5.6 kg body weight were placed outdoor with partial roof. Blood samples were collected to do genotyping of HSP70-2 using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) technique. Ambient temperature, relative humidity and physiological responses, including rectal temperature, respiration rate, sweating rate, pulse rate, skin temperature, and N/L ratio were examined at 06.00, 14.00, 18.00 and 22.00. Genotyping revealed that there were 14 and 18...
Tipo: PhysicalObject
Palavras-chave: Dairy cattle; Genotypes; Genetic variation; Hsp70-2; Heat stress; Heat tolerant; Genetic improvement; โคนม; รูปแบบจีโนไทป์; พันธุกรรม; การแสดงออกของยีน; ความแตกต่างทางพันธุกรรม; การตอบสนองทางสรีรวิทยา; ความเครียด; อากาศร้อน; การทนร้อน; การรักษาสมดุลความร้อน; การปรับปรุงพันธุ์.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5750

Relationship between thermal comfort indices and internal temperature of grazing lactating Holstein × Gyr cows in western Amazonia
Provedor de dados: 36
Autores: CARVALHO,Giovanna Araújo de; SALMAN,Ana Karina Dias; CRUZ,Pedro Gomes da; SILVA,Francyelle Ruana Faria da; HALFEN,Jéssica; SCHMITT,Eduardo.
ABSTRACT The relationship between the indices of thermal comfort and internal temperature in lactating cows was evaluated inRondônia, western Amazonia in a 2 × 2 crossover trial carried out with eight Girolando cows, ½ Holstein × ½ Gyr (n=4) and – Holstein × ¼ Gyr (n=4), grazing palisade grass supplemented with or without soybean oil concentrates. Data logger thermometers adapted to intravaginal devices (hormone free) were used to measure internal temperatures (IT) every 10 min over 48 h. Concomitantly, environmental parameters (air temperature, relative humidity, wind speed, and solar radiation) were collected for the estimation of the temperature-humidity index (THI), equivalent temperature index (ETI), and predicted respiratory rate (PRR)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Holstein × Zebu; Dairy cattle; Environmental stress index.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000300191

Adaptive parameters and thermal comfort of postpartum ewes fed on concentrate supplementation in grazing system
Provedor de dados: 2
Autores: Rocha, Ronne-von Ribeiro da; Universidade Federal do Piauí; Oliveira, Petrônio Batista de; Universidade Federal do Piauí; Nunes, Amaury Guimarães; Universidade Federal do Piauí; Silva, Tairon Pannunzio Dias e; Universidade de São Paulo; Pereira, Alécio Matos; Universidade Federal do Piauí; Torreão, Jacira Neves da Costa; Colégio Técnico de Bom Jesus.
Current analysis evaluated adaptive parameters and thermal comfort of postpartum ewes fed on concentrate supplementation in grazing system. Thirty lactating pluriparous sheep, 16 Santa Inês (SI) and 14 Morada Nova (MN) were used. Physiological parameters such as respiratory rate (RR), heart rate (HR) and rectal temperature (RT) were measured, in that order, with the animals at rest in the morning (6:00-7:00 am) and in the afternoon (1:00-2:00 pm), respectively, every seven days, with 10 samples. A significant effect (p &amp;lt; 0.05) for RR and HR was reported in the strain. Similar behavior was reported for RR between the breeds where MN sheep had high adaptability. Supplementation levels of 0.5 and 1.5% influenced (p &amp;lt; 0.05) RR which was stronger...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental factors; Heat stress; Nutrition; Thermoregulation.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/22823

The effects of protein, amino acid, and dietary electrolyte balance on broiler chicken performance and blood parameters under heat stress
Provedor de dados: 2
Autores: Saki, Ali Asghar; Maleckey, Mostafa; Johari, Rahele; Mirzaie Goudarzi, Sara; Abdolmaleki, Mansoureh.
The effect of crude protein (CP), amino acid (AA), and dietary electrolyte balance (DEB) were evaluated on blood parameters, carcass traits, and broiler performance under heat stress (29-34°C). A total of 540 male chickens (Ross 308) were allocated to 12 diets with factorial arrangement 2 × 2 × 3, using a completely randomized design with three replicates of 15 chickens in grower (13 to 26 days) and finisher (27 to 42 days) periods. and 120, 220, and 320 mEq kg-1 DEB. The level of 21% CP increased body weight gain (BWG) and decreased feed conversion ratio (FCR) at grower period (p &lt; 0.05). In contrast, 20% CP level decreased BWG and increased FCR at finisher period (p &lt; 0.05). Further, 20% CP level reduced blood sodium and blood electrolyte balance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Standard and additional of digestible amino acid; Heat stress; Carcass traits.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/30747

Performance evaluation and adaptability of lactating dairy cows fed soybean and its by-products
Provedor de dados: 2
Autores: Vasconcelos, Angela Maria de; Dias, Marcia; Nascimento, Vinicio Araújo; Façanha, Débora Andréa Evangelista.
Aiming to evaluate the lactation performance and adaptability of confined dairy cows fed diets containing soybean and its by-products, this study used 12 Holsteincows with initial production of 30 kg milk-1 day-1 day-1 in feedlot system distributed in a 4 x 4 Latin square design. The experimental period lasted 84 days. The dry matter intake (DMI) and meteorological variables were recorded daily. Milk production was measured from the 15th to the 21st day, with milk analysis twice in each period, and physiological variables collected on the 15, 17th and 21st days of each experimental period. The thermal comfort indices and rectal temperature were considered normal, however the respiratory frequency and heart rate were different between the periods. Total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Production and composition of milk; Rectal temperature; Heat stress; Thermoregulation.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/22810

Efeitos da disponibilidade de sombra sobre o desempenho, atividades comportamentais e parâmetros fisiológicos de vacas da raça Pitangueiras - DOI: 10.4025/actascianimsci.v31i3.5279
Provedor de dados: 2
Autores: Silva, Érica Carla Lopes da; UFRPE; Modesto, Elisa Cristina; UFRPE; Azevedo, Marcílio de; UFRPE; Ferreira, Marcelo de Andrade; UFRPE; Dubeux Junior, José Carlos Batista; UFRPE; Schuler, Alexandre Ricardo Pereira; UFPE.
O trabalho teve como objetivo avaliar a produção, composição e o perfil de ácidos graxos do leite, parâmetros fisiológicos e atividades comportamentais de vacas da raça Pitangueiras, submetidas à condição de pastejo com e sem acesso à sombra. O ambiente foi monitorado diariamente em uma estação meteorológica. O delineamento experimental foi o inteiramente casualizado, sendo que 20 vacas em lactação foram divididas em piquetes nos tratamentos com e sem acesso à sombra. Não houve diferença (p &gt; 0,05) entre os tratamentos quanto às variáveis fisiológicas, produção, composição e perfil de ácidos graxos do leite. Os animais com acesso à sombra buscaram o sombrite nos horários em que os índices de conforto térmico foram mais elevados. No turno da tarde os...
Tipo: Pesquisa de campo;análise laboratorial
Palavras-chave: Ácidos graxos; Comportamento; Estresse térmico; Fatores ambientais; Temperatura retal ciências agrárias acids fatty; Behavior; Environment; Heat stress; Shading; Dairy cows.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/5279

Efeito da suplementação alimentar nas respostas fisiológicas, hormonais e sanguíneas de ovelhas Santa Inês, Ile de France e Texel - DOI: 10.4025/actascianimsci.v31i4.4920
Provedor de dados: 2
Autores: Amaral, Daniele Francine; UEM; Barbosa, Orlando Rus; UEM; Gasparino, Eliane; UEM; Akimoto, Luciene Setsuko; UEM; Lourenço, Fábio José; UEM; Santello, Graziela Aparecida; UEM.
Avaliou-se a suplementação de proteína (12% de proteína bruta (PB) (T1) e 16% de PB (T2)) na temperatura retal (TR), frequências respiratória (FR) e cardíaca (FC), glicose (Gl), albumina (Alb), proteínas totais (PT), triiodotironina (T3) e tiroxina (T4) de 16 ovelhas Santa Inês, 16 Texel e 15 Ile de France. A FR não diferiu no T1 e T2 na Santa Inês e Ile de France, sendo maior na Texel no T2. FR aumentou na primavera, na Texel, seguida da Ile de France e pela Santa Inês e caiu no outono para Santa Inês e Ile de France. FR foi maior à tarde, na Texel, na Ile de France e na Santa Inês. Maior FC na Santa Inês e Texel no T1 e menor na Ile de France. FC na Santa Inês foi superior nas estações do ano, e na primavera maior para todas as raças. Maior Gl, PT, Alb e...
Tipo: Pequisa de campo
Palavras-chave: Dieta; Proteína; Condições climáticas estresse térmico; Hormônios; Ovelhas Ecologia dos Animais Domésticos e Etologia diet; Protein; Weather conditions; Heat stress; Hormones; Sheep.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/4920

Heat tolerance index, food intake and weight gain of Santa Ines sheep in the agreste region of Pernambuco State, Brazil - doi: 10.4025/actascianimsci.v35i3.18466
Provedor de dados: 2
Autores: Silva Filho, Florisval Protásio; Universidade Federal Rural de Pernambuco; Azevedo, Marcílio de; Universidade Federal Rural de Pernambuco; Costa, Lígia Alexandrina Barros da; Universidade Federal Rural de Pernambuco; Lana, Ângela Maria Quintão; Universidade Federal de Minas Gerais; Ferreira, Marcelo de Andrade; Universidade Federal Rural de Pernambuco; Batista, Ângela Maria Vieira; Universidade Federal Rural de Pernambuco.
This study evaluated the influence of coat color on the heat tolerance and performance of 21 Santa Inês lambs, non-pregnant, non-lactating, seven animals of each coat color: black, brown and white, with an average initial weight of 25.71, 24.85 and 25.00 kg, for white, brown and black animals, respectively, and 12 months of age. The study was conducted during summer in the agreste region of Pernambuco   State, Brazil. Twenty-one sheeps were assigned to a completely randomized design with three treatments and seven replicates. The heat tolerance index and the animal performance were evaluated once a week for eight weeks. White sheep were slightly superior in heat tolerance to brown and black sheep, 88.3, 85.5 and 86.6 respectively, but this was not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adaptation; Bioclimatology; Climate; Heat stress.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/18466

Thermal comfort and grazing behavior of Girolando heifers in integrated crop-livestock (ICL) and crop-livestock-forest (ICLF) systems
Provedor de dados: 2
Autores: Souza, Elaine Coimbra de; Salman, Ana Karina Dias; Cruz, Pedro Gomes da; Veit, Hemerson Maciel; Carvalho, Giovanna Araújo de; Silva, Francyelle Ruana Faria da; Schmitt, Eduardo.
To compare the integrated crop-livestock-forest (ICLF) and crop-livestock (ICL) systems in relation to thermal comfort and grazing behavior of Girolando heifers, a 2 × 2 crossover trial (two system and two periods) was carried out with eight ¾ Holstein × ¼ Gyr heifers in Xaraés–palisade grass pasture under intermittent stocking with 10 days of occupation period and 20 days of resting. In ICLF, crown cover of eucalyptus planted in rows was 65% at the beginning of the experiment. Animal behavior was assessed through bioacoustics by recording heifers’ sounds for 48 hours. Concomitantly, heifers’ internal temperature (IT,°C) was recorded every 10 min using data logger thermometers adapted to hormone-free intravaginal devices. Air temperature and humidity data...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.04.04.00-0 Agrosilvopastoral; Wellbeing; Heat stress.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/46483

Thermoregulation of Girolando cows during summertime, in Pernambuco State, Brazil - doi: 10.4025/actascianimsci.v35i2.16591
Provedor de dados: 2
Autores: Lima, Ivalda de Albuquerque; Universidade Federal Rural de Pernambuco; Azevedo, Marcilio de; Universidade Federal Rural de Pernambuco; Borges, Christhiano Raphael de Albuquerque; Universidade Federal Rural de Pernambuco; Ferreira, Marcelo de Andrade; Universidade Federal Rural de Pernambuco; Guim, Adriana; Universidade Federal Rural de Pernambuco; Almeida, Gledson Luiz Pontes de; Universidade Federal Rural de Pernambuco.
This work was carried out to evaluate the physiological thermoregulation responses of Girolando-breed dairy cows kept in feedlot during summertime. A total of 15 animals were used, belonging to three genetic groups: 1/2, 5/8 and 3/4 Holstein-Gir (HG), with five cows from each genetic group, distributed in a completely randomized design, in subplots. The physiological parameters were sweat rate (SR), respiratory rate (RR), epidermis temperature (ET) and coat surface temperature (CST), and were evaluated once a week, during nine weeks, from December 2009 to February 2010, totaling 135 observations. Throughout the experimental period, climatic data were recorded using an automated weather station, and later used to calculate the different thermal comfort...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy cattle raising; Heat stress; Physiological parameters.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/16591

Cotton productivity enhanced through transplanting and early sowing
Provedor de dados: 3
Autores: Ahmad, Saghir; Iqbal, Muhammad; Muhammad, Taj; Mehmood, Abid; Ahmad, Shakeel; Hasanuzzaman, Mirza.
Due to high temperatures in arid regions, cotton crop emergence and early establishment of seedlings are adversely affected. Field studies were undertaken to quantify the effects of transplantation of cotton (Gossypium hirsutum L.) seedlings during the early part of the growing season (March) and crop season (May) for potential realization of cotton productivity under the harsh weather of the southern part of Punjab province, Pakistan. Treatments, consisting of (a) two planting dates (March and May), and (b) two sowing methods (transplanting of seedlings and direct seeding), were arranged in a randomized complete-block design with four replications. Results showed that transplanting seedlings improved the productivity of cotton by 14.2% over direct...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Irrigated arid environment; Planting techniques; Planting time.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/34610

Enhancing the efficiency of evaporative cooling pads for livestock barns and greenhouses by moisture adsorption
Provedor de dados: 111
Autores: Samer, Mohamed.
High levels of relative humidity negatively affect the efficiency of the evaporative cooling pads installed in livestock barns and greenhouses. Consequently, the productivity decreases causing economic losses. Therefore, this project aims at prototyping innovative dehumidifying/desiccant segments to be installed on the conventional cooling pads enabling them to provide suitable microclimate conditions, especially temperature and relative humidity, for animals and plants. The hypothesis is that desiccant segments adsorb air moisture before introducing the air into the pads; consequently, the treated air is then able to absorb more moisture from the cooling pads, i.e. the cooling pads evaporate more water in the treated air, where water evaporation requires...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural Engineering; Farm Buildings and Construction cooling pads; Livestock housing; Heat stress; Indoor air quality; Greenhouses.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3450

Effects of a near infrared-reflecting greenhouse roof cover on the microclimate and production of tomato in the tropics
Provedor de dados: 111
Autores: Mutwiwa, Urbanus Ndungwa; Tantau, Hans Jurgen; Elsner, Bukhard von; Max, Johannes F. J.
The effects of a shading paint containing NIR-reflecting pigments applied to the roof of an experimental greenhouse on greenhouse microclimate, plant response of a tomato crop and fruit yield and quality were studied under the tropical climate conditions of Central Thailand. One experiment was carried out in the rainy (2006) season and in the dry (2005/2006) season.The maximal reduction of the air temperatures inside the greenhouse with the NIR reflecting roof paint was observed during the dry season. At this time the temperature in this house was 2.8 °C lower than in the control greenhouse without shading paint. On average the temperature reduction was 2 °C in the dry and 0.6 °C in the rainy season. The magnitude of the temperature reduction was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protected cultivation Shading; Heat stress; Greenhouse cooling; Plant response.
Ano: 2017
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3956

Human Heat stress risk prediction in the Brazilian semiarid Region based on the Wet-Bulb Globe Temperature
Provedor de dados: 42
Autores: OLIVEIRA,BEATRIZ FÁTIMA A. DE; SILVEIRA,ISMAEL HENRIQUE; FEITOSA,RENATO C.; HORTA,MARCO AURÉLIO P.; JUNGER,WASHINGTON L.; HACON,SANDRA.
Abstract: Objective: the aim of this study is to map thermal stress risks for human health at the São Francisco River Basin (SFRB) in the Semiarid region, for climatic scenarios RCP 4.5 and 8.5. Methods: The heat stress conditions were defined by the Wet Bulb Globe Temperature (WBGT) indicator and by the average number of annual days in which the WBGT values exceeded the 90th percentile of the reference period. The WBGT was estimated for the climate scenarios RCP 4.5 (intermediate) and 8.5 (pessimistic) for the period 2011-2090 comparing to the period of reference (1961-2005). Results: The projections show that for the pessimistic scenario practically all municipalities of the SFRB region can reach values of WBGT that indicate a high risk for heat stress...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Heat stress; Health impacts; Wet Bulb Globe Temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500808

Effect of heat exposure on the thermoregulatory responses of selected naked neck chickens
Provedor de dados: 45
Autores: Mazzi,C.M.; Ferro,M.I.T.; Coelho,A.A.D.; Savino,V.J.M.; Macari,M.; Ferro,J.A.; Givisiez,P.E.N.; Giachetto,P.F.; Silva,M.M.; Dionello,N.J.L.
The variation in cloacal temperature, body weight loss and expression of the 70 kDa heat shock protein (Hsp70) in three naked neck broiler genotypes during heat stress were studied. Twelve birds of each genotype (Na/Na, Na/na and na/na) were reared to market weight (approximately 2.1kg) at thermoneutral temperature. Six birds from each group served as controls and the remaining six underwent gradual heat stress (from 28ºC to 36ºC). Cloacal temperature and body weight were measured before and after exposure to heat. Liver samples were collected and Hsp70 levels were quantified using western blotting with monoclonal anti-chicken Hsp70 antibody. Heterozygous (Na/na) birds had a significantly lower cloacal temperature variation and less body weight loss during...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler chicken; Naked neck genotype; Hsp70 expression; Heat stress; Cloacal temperature.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352002000100006

Energetic status of crossbreed dairy cows during transition period in two different seasons
Provedor de dados: 45
Autores: Moreira,T. F.; Facury Filho,E. J.; Meneses,R. M.; Mendonça,F. L. M.; Lima,J. A. M.; Carvalho,A. U.
ABSTRACTWe used 31 crossbreed dairy cows to compare the energetic profile in summer and winter. Blood samples were taken weekly prepartum, at calving and on days 2, 5, 10, 15, 21 and 30 postpartum. All metabolic indicators analyzed were influenced by the physiological status. The glucose concentrations were higher during winter while the triglyceride concentrations and lactate dehydrogenase (LDH) were higher in the summer. The season influenced the concentrations of cholesterol, AST and GGT, showing a different pattern between summer and winter. Non-esterified fatty acids (NEFA) and beta-hidroxibutirate (BHB) were not influenced by the season. Cows that calved during winter had a greater body condition score (BCS) and lost more BCS until calving. During...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NEFA; Monitoring; Herd health; Heat stress.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352015000501327

Artificial cooling as an alternative to increase productivity and welfare of steers under heat stress
Provedor de dados: 45
Autores: Correa-Calderón,A.; Morales,M.; Avendaño,L.; Leyva,C.; Rivera,F.; Díaz,R.; Soto-Navarro,S.
The effects of a cooling system on productive efficiency and welfare of Holstein steers were evaluated during the summer. Sixty steers in the finishing phase were randomly allotted to one of two treatment-groups. Animals of control group were only provided with shade (non-cooled group) and a group of animals under a cooling system were installed in the shaded area (cooled group), which were operated daily from 09am to 6pm during the 69d of the study. The averages of environmental temperature and relative humidity were 35.4°C and 35.3%, respectively, with a temperature-humidity index average of 81.4 during the study. Individual body weight was recorded every two weeks, while body surface temperature and respiratory frequency were recorded three times per...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Steer; Cooling system; Feedlot; Heat stress; Performance.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352010000500024

Can the critical temperature for photochemical damage in common bean plants be changed after a drought event?
Provedor de dados: 53
Autores: Ribeiro,Rafael Vasconcelos; Santos,Mauro Guida dos; Pimentel,Carlos; Machado,Eduardo Caruso; Oliveira,Ricardo Ferraz de.
Low water availability and high temperatures occur under field conditions and we hypothesize that the critical temperature for photochemical damage (TC) in common bean (Phaseolus vulgaris L.) plants is increased by the occurrence of previous water deficit in a genotype-dependent manner. Five common bean cultivars A320, A222, Carioca, BAT477 and Ouro Negro were evaluated. Thirty days after seedlings emergence, one group of plants was exposed to water deficit for ten days and rehydrated and another one was maintained well hydrated during the experimental period. The minimum chlorophyll fluorescence (FO) was monitored in leaf discs exposed to temperatures ranging from 25 to 45 oC and the TC values estimated. The previous water deficit did not affect TC, which...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Chlorophyll fluorescence; Hardening; Heat stress; Phaseolus vulgaris; Tolerance.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000400374

Effects of propofol on damage of rat intestinal epithelial cells induced by heat stress and lipopolysaccharides
Provedor de dados: 56
Autores: Tang,J.; Jiang,Y.; Tang,Y.; Chen,B.; Sun,X.; Su,L.; Liu,Z.
Gut-derived endotoxin and pathogenic bacteria have been proposed as important causative factors of morbidity and death during heat stroke. However, it is still unclear what kind of damage is induced by heat stress. In this study, the rat intestinal epithelial cell line (IEC-6) was treated with heat stress or a combination of heat stress and lipopolysaccharide (LPS). In addition, propofol, which plays an important role in anti-inflammation and organ protection, was applied to study its effects on cellular viability and apoptosis. Heat stress, LPS, or heat stress combined with LPS stimulation can all cause intestinal epithelial cell damage, including early apoptosis and subsequent necrosis. However, propofol can alleviate injuries caused by heat stress, LPS,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Propofol; Heat stress; Lipopolysaccharides; Apoptosis; Intestinal epithelial cells.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000600507

IV.Heat stress in Triticum: kinetics of Fe and Mn accumulation
Provedor de dados: 61
Autores: Dias,Ana S.; Lidon,Fernando C.; Ramalho,José C.
The interactions between Fe/Mn accumulation and the photosynthetic light reactions were investigated in heat stressed bread and durum wheat genotypes (Triticum aestivum L. and Triticum turgidum subsp.durum). Four genotypes were chosen according to its genetic background diversity. Plants were grown in a greenhouse at two different day/night temperatures regimes (control - 25/14ºC and heat stress - 31/20ºC), during the grain filling phase. The contents and uptake/translocation of Fe and Mn were evaluated on booting, grain filling and maturity and correlated with chlorophyll a fluorescence parameters. It was found that, under heat stress, the concentrations of Fe in the culm and leaves diminished in bread wheat, but increased in durum wheat. An opposite...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Nutrients; Translocation; Triticum aestivum L.; Triticum turgidum subsp. durum; Uptake.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000200008

III.Heat stress in Triticum: kinetics of Na, K and P accumulation
Provedor de dados: 61
Autores: Dias,Ana S.; Fernando,Ana L.; Lidon,Fernando C.
Genotypes of bread and durum wheat were submitted to heat stress after anthesis and the accumulation of Na, K and P, at booting, grain filling and maturity, were investigated. It was found that, after anthesis, the levels of Na in shoots were considerably higher in durum relatively to bread wheat, being this trend also observed in the total plant accumulation. In these genotypes, heat stress affected significantly Na concentration in shoots. In general, heat stressed plants had significant higher levels of K in the shoots and the proportion of this nutrient translocation from the roots also increased with heat stress. In general, the levels of P didn't show significant differences with heat stress. The effects of heat stress among the wheat genotypes life...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Triticum turgidum subsp. Durum; Heat stress; Nutrients uptake; Nutrients translocation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000200007

II. Heat stress in Triticum: kinetics of Cu and Zn accumulation
Provedor de dados: 61
Autores: Dias,Ana S.; Lidon,Fernando C.
The interactions between high temperatures and Cu/Zn accumulation were investigated in bread and durum wheat. Plants were grown in a greenhouse, at two different temperatures regimes (control - 25/14ºC and heat stress - 31/20ºC), and the contents and uptake/translocation of Cu and Zn were evaluated during three developmental stages of plant growth (booting, grain filling and maturity). During grain filling and at maturity it was found that root, shoot and spike concentrations of Cu increased in heat stressed plants of the genotypes Golia and Acalou. The same trend was observed for root and shoot concentrations of Zn in both durum wheat genotypes. It was concluded that plants submitted to high temperatures (during the grain filling period) become more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Triticum turgidum subsp; Durum; Heat stress; Uptake; Nutrients translocation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000200006

Photochemical efficiency in bean plants (Phaseolus vulgaris L. and Vigna unguiculata L. Walp) during recovery from high temperature stress
Provedor de dados: 61
Autores: Costa,Ernany Santos; Bressan-Smith,Ricardo; Oliveira,Jurandi Gonçalves de; Campostrini,Eliemar; Pimentel,Carlos.
Bean (Phaseolus vulgaris L., cv. Carioca and cv. Negro Huasteco) and cowpea plants (Vigna unguiculata L. Walp cv. Epace 10) were grown in a growth chamber with PPF at leaf level of 200 mumol.m-2.s-1 and air temperature 25 + 1 ºC. The first fully expanded pair of leaves of 12-day-old plants was submitted to high temperature stress (25, 30, 35, 40, 45 and 48 ºC) for 1.5 h. The photochemical efficiency of PSII during recovery was monitored by means of chlorophyll a fluorescence at six different times (0.5, 1, 2, 4, 24, and 48 h) after stress, at 25 ºC, using a modulated fluorimeter. Increasing temperature promoted an increase in Fphi at 45 ºC, possibly associated with dissociation of the light harvesting complex from the reaction centre of PSII, but a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll a fluorescence; Heat stress; Photosynthesis.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000200004

Evaporative snout cooling system on the performance of lactating sows and their litters in a subtropical region
Provedor de dados: 65
Autores: Perin,Jonas; Gaggini,Thais Schwarz; Manica,Samuel; Magnabosco,Diogo; Bernardi,Mari Lourdes; Wentz,Ivo; Bortolozzo,Fernando Pandolfo.
The aim of the study was to evaluate the influence of different temperature control systems on the voluntary feed intake (VFI), percentage of weight loss (PWL) and performance of lactating sows as well as on the weight of their piglets. Two systems were used: traditional temperature control system (TTCS) with curtain management and an evaporative snout cooling system (ESCS). The study was performed during the summer of 2011. After farrowing and at the weaning, 241 sows were weighed to evaluate the PWL during lactation. TTCS sows lost more weight (5.3±0.9%; P&lt;0.05) than ESCS sows (2.2±0.9%). VFI was measured at intervals of four days in 32 primiparous and 39 multiparous sows. ESCS sows had higher VFI (5.8±0.2kg day-1; P&lt;0.05) than TTCS sows (4.8±0.2kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Piglet; Weight; Evaporative snout cooling system; Temperature control; Voluntary feed intake.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000200342

Temperature response of photosynthesis and its interaction with light intensity in sweet orange leaf discs under non-photorespiratory condition
Provedor de dados: 64
Autores: Ribeiro,Rafael Vasconcelos; Machado,Eduardo Caruso; Oliveira,Ricardo Ferraz de.
This study aimed to evaluate the response of photosynthesis (A), given by photosynthetic O2 evolution, to increasing temperature from 25 to 50ºC in sweet orange (Citrus sinensis (L.) Osbeck) leaf discs under non-photorespiring conditions. In order to evaluate the response of gross photosynthesis to temperature and the balance between photosynthetic and respiratory activities, respiration (Rd) rates were also measured, i.e. the O2 uptake in each temperature. In addition, light response curves of photosynthesis were performed by varying the photosynthetic photon flux density (PPFD) from 0 to 1160 µmol m-2 s-1 at 25 and 40ºC. The highest A values were observed at 35 and 40ºC, whereas the highest Rd values were noticed at 50ºC. A higher relationship A/Rd was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Heat stress; High temperature; O2 evolution.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542006000400012