|
|
|
| Registros recuperados: 49 | |
|
|
| Rodrigues,Tatiana P. N. da S.; Pandorfi,Héliton; Guiselini,Cristiane; Almeida,Gledson L. P. de; Morrill,Waldirene B. B.. |
| ABSTRACT The objective of this research was to analyze the differences between the food behaviors observed under the factors of production environment, sex and lighting system, using stochastic tools of multivariate analysis. As for the thermal characteristics of the environment, air temperature (T, °C), enthalpy (H, kJ kg-1), and black globe temperature and humidity index (BGTHI) showed high positive correlation with each other and strong negative correlation with relative humidity (RH, %). The “male drinking” behavior was positively associated with thermal characteristics of the environment in the three periods of the day, that is, the act of drinking more water would be a way to alleviate thermal stress. Birds subjected to red LED showed a strong... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal welfare; Broiler farming; Lighting system; Principal component analysis; Thermal comfort. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000300272 |
| |
|
| |
|
|
| Barnabé,Janice M. C.; Pandorfi,Héliton; Gomes,Nicoly F.; Ameida,Gledson L. P. de; Guiselini,Cristiane. |
| ABSTRACT An adequate thermal environment in pig farming facilities is essential to ensure productivity and animal welfare. The objective of this study was to evaluate the behavior and performance of finishing pigs, subjected to climate-controlled environments and supplementary lighting. Twenty-seven pigs (3/4 Duroc, 1/4 Pietrain) were kept in pens with no climate control, pens with forced ventilation and pens with adiabatic evaporative cooling system, associated with 12 h of natural light, 12 h of natural light + 4 h of artificial light and 12 h of natural light + 6 h of artificial light. The experimental design was completely randomized, in a 3x3 factorial arrangement and the means were compared by Tukey test (p<0.05). Meteorological variables,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal ambience; Behavior; Thermal comfort; Weight gain. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000300294 |
| |
|
| |
|
|
| Silva,Irenilson M. da; Pandorfi,Héliton; Vasconcelos,Ângelo J. S. de; Laurenti,Renato; Guiselini,Cristiane. |
| Due to the importance of the environment on animal production and thus environmental control, the study aims to build a system for monitoring and control the meteorological variables, temperature and relative humidity, low cost, which can be associated with an evaporative cooling system (ECS). The system development included all the stages of assembly, test and laboratory calibration, and later the validation of the equipment carried in the field. The validation step showed results which allowed concluding that the system can be safely used in the monitoring of these variables. The controller was efficient in management of the microclimate in the waiting corral and allowed the maintenance of the air temperature within the comfort range for dairy cattle in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Thermal comfort; Instrumentation. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000100001 |
| |
|
|
| Brasil,Daniel de F.; Guimarães,Michelle de O.; Barbosa Filho,José Antonio D.; Freitas,Breno M.. |
| This study aimed to investigate the ideal brood area to be introduced for strengthening Apis mellifera colonies, considering variations in the hive's internal ambience. Therefore, eight colonies were equipped with data loggers for recording variations in temperature and humidity inside the hives. Then, these colonies were split in four treatments involving the swapping of four, three, two and one brood comb between strong and weak colonies. Growth in the amount of brood and food stores to the four colony strengthening treatments was assessed counting the comb cells to record changes in the brood and food area. The colonies tended to restore their normal thermoregulation within four hours after they had been manipulated and the hive cover had been closed,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Colony homeostasis; Thermal comfort; Colony management. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000500002 |
| |
|
|
| Amaral,Pedro I. S.; Campos,Alessandro T.; Yanagi Junior,Tadayuki; Cecchin,Daiane; Leite,Evandro M.; Dias e Silva,Nhayandra C.. |
| ABSTRACT Although dry bulb temperature (T) is the environmental variable most commonly used to classify thermal comfort in pigs, environmental assessment ratios provide more accurate information. The objective of this study was to correlate the sound pressure levels (SPL) produced by piglet vocalization with the thermal environment observed during the nursery phase, and subsequently establish thermoneutrality ranges. The experiment was conducted on a pig farm where T, relative humidity (RH), and SPL data were recorded between 9 am-5 pm for 42 days. The association between SPL and T in nursery phase piglets was verified; for thermal comfort to be possible, SPLs were 56.3 to 60.3 dB. The SPLs were subsequently used in predictor equations of ratios, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ambience; Animal welfare; Nursery; Rearing; Thermal comfort. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000300266 |
| |
|
| |
|
|
| Souza,Maria de F. P; Turco,Silvia H. N.; Silva,Eva M. S; Costa,Daniel dos S; Freire,Murilo S.. |
| ABSTRACT The current study aimed to evaluate the influence of three colors and two types of roofing materials under the internal temperature of bee colonies Apis mellifera. The experiment was conducted at the Agricultural Sciences Campus at the Federal University of Sao Francisco Valley located in Petrolina-PE, in November and December 2013, using 24 colonies housed in Langstroth hives. The experiment was a completely randomized factorial design (3x2) with three colors of box (blue, white, and traditional) and two types of cover (with and without the use of plaster) with six treatments and four replications. The internal temperature dates of the colonies were hourly recorded, during 24 hours, and surface temperatures were hourly recorded between 08h00 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Thermal comfort; Insects; Temperature. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000400625 |
| |
|
|
| Coradi,Paulo C.; Martins,Márcio A.; da Costa,Douglas R.; Vigoderis,Ricardo B.; Tinôco,Ilda de F. F.. |
| ABSTRACT Animal welfare is essential for livestock yield gains, which has been ethically justifiable and socially acceptable. Thus, our research aimed to test computational fluid dynamics model (CFD) to simulate heated air within a poultry barn. Data were simulated in CFD software based on Navier-Stokes equations (geometry of 3 m x 6 m, considering a symmetric mesh). As boundary conditions, a temperature of 38ºC was considered for walls where heating pipe outlets are, to the west side, besides a heat flow of zero, in symmetry to the same side. As for the sides east, south and north, walls were taken as isolated, i.e. heat flow equals to zero. The aviary heating system did not achieve a homogeneous temperature distribution, heat flow, heated air pressure... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environment; Animals; Thermal comfort; Airflow. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000500768 |
| |
|
|
| Silva,Irenilson M. da; Pandorfi,Héliton; Almeida,Gledson L. P.; Guiselini,Cristiane; Henrique,Hugo M.. |
| The aim of this paper was to evaluate the automated acclimatization effects during pre-milking of cows on thermal conditioning, physiology, milk production and cost-benefit of the automated adiabatic evaporative cooling system (AECS). The treatments 20; 30; 40 min and control consisted of exposure time of pre-milking cows to the automated AECS. Sixteen cows were used with an average daily milk yield of 19 kg, distributed in a 4 x 4 Latin square design. The Tukey's test (P<0.05) was used to compare the means. The environmental variables, dry bulb temperature (DBT, ºC) and relative humidity (RH, %), were recorded every minute, which allowed the determination of the system efficiency through the Temperature and Humidity Index (THI). The respiratory rate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Thermal comfort; Automation; Dairy cattle; Evaporative cooling system. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000500002 |
| |
|
| |
|
|
| Leva,Flávia F. de; Camacho,José R.; Oliveira Filho,Delly. |
| This study was conducted to evaluate and compare the behavior of the heating inside poultry shed through gas hood and underfloor heating. The experiment was conducted in poultry shed belonging to the Federal Institute of Education, Science and Technology of Triângulo Mineiro Region, Uberlândia city  state of Minas Gerais (MG), Brazil. The dimensions of the shed are 24 meters long and 9.6 meters wide and with a ceiling height of 3.2 meters. The temperature was measured with an optical thermometer of Minipa brand, MT 350 model. It was used, to the analysis of temperature behavior, the public domain software FEMM 4.2, which uses finite elements techniques, with data collected from two lots. Underfloor heating is made using hot water flowing through a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy consumption; Underfloor heating; Environment; Thermal comfort; Solar energy. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400023 |
| |
|
|
| Ponciano,Patrícia F.; Yanagi Junior,Tadayuki; Lima,Renato R. de; Schiassi,Leonardo; Teixeira,Vitor H.. |
| The broiler rectal temperature (t rectal) is one of the most important physiological responses to classify the animal thermal comfort. Therefore, the aim of this study was to adjust regression models in order to predict the rectal temperature (t rectal) of broiler chickens under different thermal conditions based on age (A) and a meteorological variable (air temperature - t air) or a thermal comfort index (temperature and humidity index -THI or black globe humidity index - BGHI) or a physical quantity enthalpy (H). In addition, through the inversion of these models and the expected t rectal intervals for each age, the comfort limits of t air, THI, BGHI and H for the chicks in the heating phase were determined, aiding in the validation of the equations and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Thermal environment; Poultry; Thermal comfort; Mathematical modeling; Physiological responses. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100002 |
| |
|
|
| Cândido,Márcia G. L.; Tinôco,Ilda De F. F.; Pinto,Francisco de A. de C.; Santos,Nerilson T.; Roberti,Ricardo P.. |
| ABSTRACT Environmental temperatures currently considered within comfort zone for broiler rearing may be misleading or even obsolete from actual values. Some factors such as animal genetics, nutrition and poultry management, mainly acclimatization to tropical and subtropical conditions, influence in determining the comfort zone for birds. This study aimed to evaluate the effects of five different thermal environments on animal welfare and rearing performance of broiler chickens, setting an ideal temperature range (comfort zone) for each of the first three weeks of poultry breeding. The chicks (375) were randomly placed into five climatic chambers set to distinct thermal conditions, being: one as recommended by the literature, another as stated by Cassuce... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Poultry; Thermal comfort; Animal performance; Cold stress. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000500760 |
| |
|
|
| Abreu,Lucas H. P.; Yanagi Junior,Tadayuki; Campos,Alessandro T.; Bahuti,Marcelo; Fassani,Édison J.. |
| ABSTRACT: The cloacal and surface temperatures are important physiological parameters to quantify the thermal comfort of animals, its variations may occur as a function of thermal variables. In this context, the goal of the present study was to evaluate the cloacal (tclo) and surface (tsur) temperatures of Cobb 500® broilers, in the second week of life, subjected to different air dry-bulb temperature (24, 27, 30 and 33 °C) and stress durations (1, 2, 3 and 4 days). The experiment was carried out in four climate-controlled wind tunnels. Air relative humidity and air velocity were set at 60% and 0.2 m s-1, respectively. The tclo and tsur were measured daily through digital thermometer and thermographic camera, respectively. Analysis of variance and Scott... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal environment; Aviculture; Thermal comfort; Thermographic image; Physiologic parameters. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000500877 |
| |
|
| |
|
|
| Furtado,Dermeval A.; Amancio,Daniele; Nascimento,José W. B. do; Gomes,Josivanda P.; Silva,Rafael C.. |
| The study was conducted in a facility for pigs during the nursery and finishing in the town of 'Montadas', in the semiarid of the state of Paraiba, Brazil, in the rainy and dry season, aiming to evaluate the concentration of oxygen, methane, carbon monoxide and ammonia, and the bioclimatic indexes: ambient temperature (AT), relative humidity (RH) and the index of black globe temperature and humidity (IBGTH). These indexes differed significantly (P>0.05) between the periods and times. The AT in the rainy season was in the thermal comfort zone(TCZ) in most of the times in the nursery; for the finishing phase, thermal discomfort occurred; during the dry season, there was thermal comfort in the nursery phase; in the finishing phase the thermal discomfort... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Welfare; Thermal comfort; Gases; Semiarid. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100004 |
| |
|
| |
|
| |
| Registros recuperados: 49 | |
|
|
|
