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Provedor de dados:  REA
País:  Brazil
Título:  Adjust of regression models to estimate the rectal temperature of broilers for the first 14 days of life
Autores:  Ponciano,Patrícia F.
Yanagi Junior,Tadayuki
Lima,Renato R. de
Teixeira,Vitor H.
Data:  2012-02-01
Ano:  2012
Palavras-chave:  Thermal environment
Thermal comfort
Mathematical modeling
Physiological responses
Resumo:  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 the preliminary limits for H. The experimental data used to adjust the mathematical models were collected in two commercial poultry farms, with Cobb chicks, from 1 to 14 days of age. It was possible to predict the t rectal of conditions from the expected t rectal and determine the lower and superior comfort thresholds of broilers satisfactorily by applying the four models adjusted; as well as to invert the models for prediction of the environmental H for the chicks first 14 days of life.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Associação Brasileira de Engenharia Agrícola
Relação:  10.1590/S0100-69162012000100002
Formato:  text/html
Fonte:  Engenharia Agrícola v.32 n.1 2012
Direitos:  info:eu-repo/semantics/openAccess

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