Classical nonlinear models to describe the growth curve for Murrah buffalo breed

Ciência Rural

Ronyere Olegário De Araújo²  Cintia Righetti Marcondes¹  Maria Cecília Florisbal Damé¹  Analía Del Valle Garnero¹  Ricardo José Gunski¹  Dionéia Magda Everling²  Paulo Roberto Nogara Rorato² 

[1] ,Universidade Federal de Santa Maria Departamento de Zootecnia Santa Maria RS ,Brasil

关键词: asymptotic weight;    buffalo;    maturation rate;    bubalinos;    peso assintótico;    taxa de maturação;   

DOI  :  10.1590/S0103-84782012000300022

来源: SciELO

【 摘 要 】

With the objective of to adjust nonlinear models for the growth curves for a buffaloes herd raised in floodable lands in Rio Grande do Sul state, monthly records measured from birth to two years-old of 64 males and 63 females born between 1982 and 1989 were used. The models used were: Von Bertalanffy, Brody, Gompertz and Logistic. The parameters were estimated by NLIN procedure and the criteria used to evaluate the adjustment given by the models were: asymptotic standard deviation; coefficient of determination; average absolute deviation of residues and asymptotic index. Von Bertalanffy and Brody models overestimated the male asymptotic weight (A) in 15.9 and 171.3kg, respectively, and the Gompertz and Logistic models underestimated it in 4.5 and 13.4kg, respectively. For females, the Logistic model underestimated the asymptotic weight (-2.09kg), and Gompertz, Von Bertalanffy and Brody overestimated this parameter in 8.04, 17.7, and 280.33kg, respectively. The biggest average deviation was estimated by Brody model for both sexes, characterizing the biggest index. Considering the criteria, it is recommended the Gompertz and Logistic models for adjust females and males Murrah buffaloes breed growth curves.

【 授权许可】

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