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Analysis of growth curve in Santa Ines females sheep / Análise da curva de crescimento em fêmeas da raça Santa Inês

Junqueira Oliveira, Elisa; de Paula Freitas, Anielly; Lourenço Ferreira, Roana; Fernanda Simili, Flavia; El Faro, Lenira; Lucia Pereira Lima, Maria; Lopes Dias Costa, Ricardo; Cristina Paro de Paz, Claudia.
Artigo em Inglês | VETINDEX | ID: vti-468041


In a sheep production system, the growth-related characteristics have direct relationship to both, quantity and quality of meat. The objective of this study was to evaluate the application of non-linear models to report the growth curve of Santa Inês sheep. Weights of 140 females, born from2010 to 2012, from a single herd at Cravinhos- SP were used. The weights were measured from birth to about one year of age and the ages were grouped together in biweekly classes. The average weight observed at birth was of 3.77±0.92 kg. The non-linear models utilized in the data adjustment were the Brody, Gompertz, Logistic and Von Bertalanffy models, adjusted by the Gauss-Newton method by means of NLIN procedure, available in SAS software. The parameters which compose the functions, Wt (kg) is the weight in time t (days); A (kg) is the asymptotic weight when age tends to infinity; b is an integration constant, related to the initial weights of the animals and not well defined biological interpretation, and k is the maturity rate. The average estimates for A and k, are the most important from an zootechnical parameters point of view, mainly because heavier females tend to create faster growing sheep. All the models evaluated reached convergence. The quality of the models adjustment was done by error mean square (EMS) means. From the EMS results , the Gompertz model showed the best adjustment,
O artigo não apresenta resumo em português.
Biblioteca responsável: BR68.1