Ability of non-linear mixed models to predict growth in laying hens

Revista Brasileira de Zootecnia

Galeano-Vasco, Luis Fernando¹  Narváez-Solarte, William²  Cerón-Muñoz, Mario Fernando¹ 

[1] Universidad de Antioquia, Medellín, Colombia;Universidad de Caldas, Manizales, Colombia

关键词: chickens;    mathematical models;    poultry;    regression analysis;    weight gainIntroductionGrowth can be defined as body weight gain or weight gain of body parts with age;   

DOI  :  10.1590/S1516-35982014001100003

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

In this study, the Von Bertalanffy, Richards, Gompertz, Brody, and Logistics non-linear mixed regression models were compared for their ability to estimate the growth curve in commercial laying hens. Data were obtained from 100 Lohmann LSL layers. The animals were identified and then weighed weekly from day 20 after hatch until they were 553 days of age. All the nonlinear models used were transformed into mixed models by the inclusion of random parameters. Accuracy of the models was determined by the Akaike and Bayesian information criteria (AIC and BIC, respectively), and the correlation values. According to AIC, BIC, and correlation values, the best fit for modeling the growth curve of the birds was obtained with Gompertz, followed by Richards, and then by Von Bertalanffy models. The Brody and Logistic models did not fit the data. The Gompertz nonlinear mixed model showed the best goodness of fit for the data set, and is considered the model of choice to describe and predict the growth curve of Lohmann LSL commercial layers at the production system of University of Antioquia.

【 授权许可】

Unknown