Consulta: creatorFacets:"Macari,M"
Registros recuperados: 25
Data/hora: 10/06/2024 17:08:17

Effect of Broiler Breeder Age and Glutamine Supplementation on the Development of the Intestinal Mucosa of 7-Day-Old Chicks
Provedor de dados: 89
Autores: Maiorka,A; Silva,AVF; Santin,E; Dahlke,F; Bruno,LDG; Boleli,IC; Macari,M; Trautenmuller,H.
ABSTRACT The aim of this study was to evaluate the possible effects of glutamine and broiler breeder age on the development of intestinal mucosa in broiler chicks during first week of age. For this purpose, 32 one-day-old broiler chicks were distributed according to a completely randomized experimental design in a 2 x 2 factorial arrangement. Treatments consisted of two broiler breeder ages (30 and 60 weeks) and two dietary glutamine supplementation levels (0% and 1%). The morphological development of intestinal mucosa, particularly villus height and crypt depth, was evaluated. The results showed that the supplementation with 1% of glutamine influenced the development of villus height in the duodenum (p=0.009), jejunum (p = 0.006), and ileum (p = 0.001),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler breeder age; Glutamine; Intestinal mucosa; Morphology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000100017

Effect of Environmental Temperature During the First Week of Brooding Period on Broiler Chick Body Weight, Viscera and Bone Development
Provedor de dados: 89
Autores: Moraes,VMB; Malheiros,RD; Furlan,RL; Bruno,LDG; Malheiros,EB; Macari,M.
The objective of the present study was to assess the development of broiler chicks during the first week post-hatching when reared at three different environmental temperatures. A total of 480 day-old chicks were placed in three environmentally controlled rooms (20, 25 and 35°C) from 1 to 7 days of age. Body weight gain, feed and water intake, as well as liver, gizzard, heart, yolk sac and bursa of Fabricius weights were measured daily. Tibia and femur bones were weighed and their length and width (medial diameter) were also obtained. The chicks reared at 20º C had lower weight gain and ingested less food than chicks reared at 25°C and less water than chicks kept at 35°C. Relative weights of the liver, heart, and gizzard were affected by environmental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body weight; Bone growth; Chicks; Environmental temperature; Viscera.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2002000100003

Discondroplasia tibial: mecanismos de lesão e controle
Provedor de dados: 89
Autores: Pizauro Junior,JM; Ciancaglini,P; Macari,M.
A discondroplasia tibial (DT) é atribuída a uma assincronia no processo de diferenciação dos condrócitos, levando à formação de uma camada de condrócitos pré-hipertróficos e de uma cartilagem na tíbia proximal que não é calcificada, mas é resistente à invasão vascular. Além disso, tem sido proposto que, na discondroplasia tíbial, a etapa final do processo de calcificação não ocorre devido ao fato de que os efetores de alguns genes, relacionados com o mecanismo de calcificação do disco de crescimento podem apresentar algumas de suas propriedades químicas ou biológicas alteradas e/ou não serem expressos. Nesse sentido, a compreensão do mecanismo de ação e o papel das biomoléculas e dos minerais relacionados com a discondroplasia tibial poderão contribuir...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcificação; Discondroplasia tibial; Mineral; Ossificação; Endocondral.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2002000300001

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

Response surface models to predict broiler performance and applications for economic analysis
Provedor de dados: 89
Autores: Faria Filho,DE; Rosa,PS; Torres,KAA; Macari,M; Furlan,RL.
A study was carried out to elaborate response surface models using broiler performance data recovered from literature in order to predict performance and elaborate economic analyses. Nineteen studies published between 1995 and 2005 were retrieved using the systematic literature review method. Weight gain and feed conversion data were collected from eight studies that fulfilled the pre-established inclusion criteria, and a response surface model was adjusted using crude protein, environmental temperature, and age as independent variables. The models produced for weight gain (r² = 0.93) and feed conversion (r² = 0.85) were accurate, precise, and not biased. Protein levels, environmental temperature and age showed linear and quadratic effects on weight gain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crude protein; Environmental temperature; Regression analysis; Response surface; Slaughter age; Systematic literature review.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2008000200009

Effect of breeder age on eggshell thickness, surface temperature, hatchability and chick weigh
Provedor de dados: 89
Autores: Gualhanone,A; Furlan,RL; Fernandez-Alarcon,MF; Macari,M.
Two experiments were carried out to study the effect of breeder age on incubation parameters (hatchability, eggshell thickness, egg surface temperature and chick weight). In Exp. 1, fertile eggs (30- and 60-wk-old breeders) were incubated at three different temperatures (36.8, 37.8 and 38.8 ºC). Eggshell surface temperature was measured by attaching a thermocouple to the shell and data were collected in a datalogger every ten minutes. This study was conducted according to a 3 x 2 factorial design (three temperatures and two breeder ages). Data revealed that eggshell surface temperature changed according to incubation temperature, with the main increase occurring between 10 and 13 days of incubation, and that the maximum increase in eggshell surface...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler breeder; Development; Embryo; Temperature; Incubation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000100002

Effect of energy intake on performance and carcass composition of broiler chickens from two different genetic groups
Provedor de dados: 89
Autores: Rosa,PS; Faria Filho,DE; Dahlke,F; Vieira,BS; Macari,M; Furlan,RL.
In order to evaluate the effect of energy intake and broiler genotype on performance, carcass yield, and fat deposition, 600 one-day-old male chicks from two different genetic groups (AgRoss 308 - commercial line and PCLC - Embrapa non-improved line) were fed diets with different metabolizable energy level (2950, 3200 and 3450 kcal/kg). A completely randomized experimental design in a 2X3 factorial arrangement with four replications of 25 birds per treatment was applied. In order to ensure different energy intake among treatments within each strain, feed intake was daily adjusted by pair-feeding schemes. AgRoss 308 broilers had better performance and carcass yield, and presented lower abdominal fat deposition rate. In both genetic groups, the highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometric growth; Broiler chickens; Carcass composition; Energy intake; Genetic strains.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000200007

Utilização de Prebióticos, Probióticos ou Simbióticos em Dietas para Frangos
Provedor de dados: 89
Autores: Maiorka,A; Santin,E; Sugeta,SM; Almeida,JG; Macari,M.
Foi investigado o efeito da substituição de antibióticos por prebiótico, probiótico e simbiótico em dietas para frangos de corte de 1 a 45 dias de idade. Foram utilizados 750 pintos de 1 dia de idade, distribuídos em cinco tratamentos, sendo: T1-sem aditivos, T2-antibiótico (Olaquindox&lt;FONT FACE=Symbol&gt;â&lt;/FONT&gt; e Nitrovin&lt;FONT FACE=Symbol&gt;â&lt;/FONT&gt; ), T3-prebiótico (0,2% de parede celular de S. cerevisiae), T4-probiótico (300 ppm de B. subtilis) e T5-simbiótico (T3 + T4). O desempenho dos frangos de 1-45 dias de idade foi influenciado pelos diferentes tratamentos, sendo o melhor ganho de peso observado em aves que receberam o simbiótico, seguido daquelas com antibiótico, prebiótico e probiótico. O pior ganho de peso foi observado nas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibióticos; Frangos; Prebióticos; Probióticos; Simbióticos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2001000100008

Effect of broiler breeder age on pancreas enzymes activity and digestive tract weight of embryos and chicks
Provedor de dados: 89
Autores: Maiorka,A; Santin,E; Silva,AVF; Routman,KS; Pizauro Jr.,JM; Macari,M.
A study was carried out to evaluate the effect of broiler breeder age on the development of the digestive tract of embryos and chicks. Fertilized eggs Cobb from 30 and 60 week-old broiler breeder was utilized in this experiment. The results showed that eggs from older (60 weeks of age) broiler breeders were heavier (p = 0.001) than those from younger (30 weeks of age) broiler breeder. In addition, older broiler breeder had larger (p = 0.001) embryos showing a higher yolk sac (p = 0.001) and higher gastrointestinal tract relative weight (p = 0.007) than those from younger broiler breeder. The activities of pancreatic lipase and trypsin enzymes were also higher in embryos from older broiler breeder than those from younger broiler breeder (p = 0.001 and p =...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler breeder age; Embryo; Enzymatic activity; Gastrointestinal tract.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2004000100003

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

Egg traits and physiological neonatal chick parameters from broiler breeder at different ages
Provedor de dados: 89
Autores: Luquetti,BC; Gonzales,E; Bruno,LDG; Furlan,RL; Macari,M.
This investigation was carried out to study egg traits (weight, specific gravity and eggshell thickness), and neonatal chick parameters (weight, blood, cardiac and lung parameters) from breeder at different ages. After hatching, neonatal chicks, male and female, from broiler breeder at three different ages (30, 45 and 60 weeks) were sacrificed and blood (red blood cell number, hematocrit, mean cell volume, blood viscosity, and haemoglobin), cardiac (right ventricle and total ventricle weights, cardiac index) and lung (mean pulmonary pressure, fresh relative lung weight) parameters were measured. No significant differences in eggshell thickness or specific gravity were observed in eggs from the three different breeder age. The incubated eggs and neonatal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler breeder age; Blood; Cardiac; Lung parameters; Neonatal chicks.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2004000100002

Pore Size Distribution in Chicken Eggs as Determined by Mercury Porosimetry
Provedor de dados: 89
Autores: La Scala Jr,N; Boleli,IC; Ribeiro,LT; Freitas,D; Macari,M.
In this study we investigated the application of mercury porosimetry technique into the determination of porosity features in 28 week old hen eggshells. Our results have shown that the majority of the pores have sizes between 1 to 10 mu m in the eggshells studied. By applying mercury porosimetry technique we were able to describe the porosity features better, by determining a pore size distribution in the eggshells. Here, we introduce mercury porosimetry technique as a new routine technique applied into the study of eggshells.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eggshell porosity; Mercury porosimetry.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2000000200007

Saccharomyces Cerevisiae cell wall dietary supplementation on the performance and intestinal mucosa development and integrity of broiler chickens vaccinated against coccidiosis
Provedor de dados: 89
Autores: Luquetti,BC; Furlan,RL; Alarcon,MFF; Macari,M.
This study was carried out to verify if Saccharomyces cerevisiae cell wall (SCCW) dietary supplementation (0.2%) was capable of protecting the intestinal mucosa of broiler chickens vaccinated against coccidiosis. Body weight gain, feed intake, feed conversion and intestinal mucosa morphometric parameters and epithelial loss were evaluated. In the experiment,400 day-old male chicks were distributed according to a completely randomized design in a 2x2 factorial arrangement. The following treatments were applied: T1 - no vaccination/ no SCCW supplementation; T2 - no vaccination/SCCW supplementation; T3 - vaccination/no SCCW supplementation; and T4 - vaccination/SCCW supplementation to four replicates of 25 birds each. Birds were vaccinated on the first day of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coccidiosis; Vaccine; Broiler; Intestinal mucosa; Morphometrics; Saccharomyces cerevisiae.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000200002

Desenvolvimento do Trato Gastrointestinal de Embriões Oriundos de Matrizes Pesadas de 30 e 60 Semanas de Idade
Provedor de dados: 89
Autores: Maiorka,A; Santin,E; Fischer da Silva,AV; Bruno,LDG; Boleli,IC; Macari,M.
O objetivo deste trabalho foi investigar o efeito da idade das matrizes pesadas sobre o desenvolvimento do trato gastrointestinal (TGI) dos embriões no terço final do período de incubação, bem como a utilização das reservas do saco vitelino nas 24 h pós-eclosão, em pintos alimentados ou em jejum. Foram utilizados ovos férteis da linhagem Cobb 500, oriundos de matrizes pesadas com 30 e 60 semanas de idade. O desenvolvimento do TGI (proventrículo+moela, segmentos do intestino delgado e saco vitelino) foi estudado entre o 17º e 21º dias de incubação (Experimento 1). Nas 24 h pós-eclosão foi pesquisado o efeito da presença ou não de alimento no lúmen intestinal sobre a utilização das reservas do saco vitelino (Experimento 2). Os achados deste trabalho...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Matrizes pesadas; Embrião; Incubação; Trato grastrointestinal; Saco vitelino.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2000000200003

Effect of Broiler Breeder Age on the Intestinal Mucosa Development of the Embryos at 20 Days of Incubation
Provedor de dados: 89
Autores: Maiorka,A; Silva,AVF; Santin,E; Bruno,LDG; Boleli,IC; Macari,M.
ABSTRACT This study investigated the effect of broiler breeder age on the morphological development of the small intestine broiler embryos (villus height, crypt depth, microvillus height, and villus density) at 20 day of incubation. Eggs obtained from 30- and 60-wk-old broiler breeders were used. The results showed that embryos from older broiler breeders presented longer villi in the duodenum, jejunum, and ileum compared with younger broiler breeders. In addition, embryos from older broiler breeders presented deeper crypts in the jejunum and ileum, longer microvilli in jejunal enterocytes, and lower villus density (microvillus number/mm2) in the duodenum and ileum than younger breeders. These results suggest that breeder age influences the gut mucosa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler breeder age; Embryo; Microvillus; Small intestine; Villus.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000600079

Water intake behavior of broiler chickens exposed to heat stress and drinking from bell or and nipple drinkers
Provedor de dados: 89
Autores: Bruno,LDG; Maiorka,A; Macari,M; Furlan,RL; Givisiez,PEN.
The aspects involved in broiler water intake are not well known, despite the importance of water in animal nutrition and physiology. Water intake behavior should be taken into account when deciding on different types of drinkers. Bell and nipple drinkers are the most commonly used in commercial broiler production. Broilers were housed in cages equipped with two different drinker types and raised at two different environmental temperatures (25 and 34 ºC) to evaluate water intake behavior and volume. Broiler water intake behavior was influenced by drinker type. Birds visited bell drinkers less often, but presented higher total water intake per visit to the drinker as compared to those drinking from nipple drinkers. The results of this study suggest that both...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Behavior; Broilers; Ingestion pattern; Water.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2011000200009

Protein levels and environmental temperature effects on carcass characteristics, performance, and nitrogen excretion of broiler chickens from 7 to 21 days of age
Provedor de dados: 89
Autores: Faria Filho,DE; Rosa,PS; Vieira,BS; Macari,M; Furlan,RL.
This trial was conducted to evaluate the utilization of low-protein diets formulated based on the ideal protein concept for broiler chickens from 7 to 21 days of age reared at different environmental temperatures. Nine hundred male Cobb-500® chickens were used. At day seven chicks were distributed according to a completely randomized design in a 3 x 3 factorial with four replications of 25 birds each. It was used three crude protein levels in the diet (21.5; 20.0 and 18.5%) and three environmental temperatures (low, thermoneutral and high). The performance, carcass characteristics (yield and chemical composition), and nitrogen ingestion and excretion were assessed. There was no significant interaction among the factors for the evaluated variables....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler Chicks; Environmental temperature; Ideal protein; Nitrogen excretion; Performance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000400009

Ornithine decarboxylase expression in the small intestine of broilers submitted to feed restriction and glutamine supplementation
Provedor de dados: 89
Autores: Fischer da Silva,AV; Borges,SA; Maiorka,A; Givisiez,PEN; Rocha,C; Macari,M.
Six hundred and forty one-day-old Cobb male broilers were used to evaluate ornithine decarboxylase (ODC) expression in the mucosa of the small intestine. Birds were submitted to early feed restriction from 7 to 14 days of age. The provided feed was supplemented with glutamine. A completely randomized design with a 2 x 2 factorial arrangement was used (with or without glutamine, with or without feed restriction). Restricted-fed birds were fed at 30% the amount of the ad libitum fed group from 7 to 14 days of age. Glutamine was added at the level of 1% in the diet supplied from 1 to 28 days of age. Protein concentration in the small intestine mucosa was determined, and ODC expression at 7, 14, 21, and 28 days of age was evaluated by dot blotting. ODC was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feed nutrition; Glutamine; Intestinal mucosa; Mucosa growth; Ornitine decarboxylase.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000200006

Atividade enzimática pancreática de frangos de corte alimentados com dietas contendo enzima ou probiótico
Provedor de dados: 89
Autores: Lima,ACF; Macari,M; Pizauro Júnior,JM; Malheiros,EB.
Este trabalho foi realizado para avaliar o efeito da adição de enzima e/ou probiótico, bem como do estresse calórico sobre a atividade de enzimas digestivas de frangos de corte aos 7, 14, 28 e 42 dias de idade. O delineamento experimental utilizado foi o inteiramente casualizado em parcelas subdivididas com 6 tratamentos primários, constituindo um esquema fatorial 6x2 (rações x temperatura) e 4 tratamentos secundários (idades de amostragem), com 2 repetições. Não foi verificado efeito significativo dos tratamentos sobre a atividade específica das enzimas, exceto para as atividades de amilase aos 14 dias e tripsina aos 28 dias de idade, nas quais a adição de enzima proporcionou maiores atividades. Já a idade de criação afetou significativamente todas as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enzima; Probiótico; Frangos de corte; Atividade enzimática; Estresse calórico.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2002000300002

Viscosidade do Sangue como Parâmetro de Diagnóstico da Síndrome Ascítica em Linhagens de Frangos de Corte com Diferentes Suscetibilidade
Provedor de dados: 89
Autores: Fontes,SF; Hernandes,R; Macari,M; Bernal,FM.
O objetivo deste trabalho foi investigar o desenvolvimento de ascites em duas linhagens diferentes de frangos de corte, Hubbard e Pescoço-pelado, através da variação da viscosidade do sangue. As aves foram criadas até 45 dias de idade em duas temperaturas ambiente diferentes (termoneutra e fria) e com dieta de ração à base de milho e farelo de soja, peletizada e de alta energia. Aos 28 e 45 dias de idade, amostras de 8 mL de sangue foram obtidas para determinação da viscosidade aparente em um viscosímetro de cilindros concêntricos da marca Brookfield, modelo LVDII+ e para determinação do hematócrito. Aos 28 dias de idade foram verificadas algumas ocorrências de ascite nas aves da linhagem Hubbard criadas à temperatura ambiente fria, e aos 45 dias de idade,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascites; Sangue; Viscosidade; Hubbard; Pescoço-pelado.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2000000100007

Effect of dietary energy and stocking density on the performance and sensible heat loss of broilers reared under tropical winter conditions
Provedor de dados: 89
Autores: Nogueira,WCL; Velásquez,PAT; Furlan,RL; Macari,M.
The objective of the present study was to evaluate the effects of different dietary energy levels and stocking densities on the thermoregulating parameters, live performance, and carcass traits of broilers reared under tropical winter conditions at different times of the day. In total, 1,312 one-d-old male broilers were used. Birds were allotted to three different stocking densities (10, 14 or 18 birds/m²) and two dietary energy levels (2900 or 3200 kcal ME/kg). The following parameters were evaluated:radiant heat load (RHL), rectal temperature (RT), feed intake (FI), weight gain (WG), feed conversion ratio (FCR), livability (L), production of live weight per area (WA), and carcass yield. Stocking density did not affect sensible heat loss (SRL) or rectal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Housing environment; Production capacity; Sensible heat; Broiler; Radiation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000100009

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

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

Intestinal and pancreas enzyme activity of broilers exposed to thermal stress
Provedor de dados: 89
Autores: Routman,KS; Yoshida,L; Frizzas de Lima,AC; Macari,M; Pizauro Jr.,JM.
Thirty-two Hubbard broilers were raised under commercial husbandry to evaluate the effect of temperature exposure (26 and 35ºC) on the activity of digestive enzymes at different ages (23 and 46 days) and different diet energy levels (2,900 and 3,200 kcal ME/kg). Data were analyzed in a 2x2x2 factorial arrangement (energy/temperature/age) in a completely randomized design. Animals were slaughtered after four hours of heat exposure for sampling of an intestinal segment, to extract alkaline phosphatase, and pancreas, to extract amylase, lipase and trypsin. The activity of intestinal alkaline phosphatase was influenced by energy level and animal age. Energy level of diet and environmental temperature interfered on the activity of pancreatic amylase. Lipase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broilers; Digestive enzymes; Thermal stress.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000100003