Comparison of Non-Linear Growth Models to Describe The Growth Curves in Fattening Friesian Crossbred and BuffaloMale Calves

摘要

The Brody, Gompertz, Logistic and Bertalanffy models were used to estimate growth curves of Friesian crossbred and Buffalo male calves during fattening period. The data consisted of 2583 and 847 weight performances of 405 Friesian crossbred and 122 buffalo male calves, respectively. Comparisons between these functions were based on coefficients of determination and absolute mean residual deviations. The estimated A-parameters were 450&420, 450&420, 574&581 and 450&420 for Friesian crossbred and buffalo calves in the four models, respectively. The respective estimated b-parameters were 146&150, 150&150, 99.91&99.99 and 100&100 while, the estimated k-parameters were 0.196&0.249, 0.848&0.864, 1.086&1.09 and 1.086&1.00. Brody model was more appropriatein describing growth curves of both Friesian crossbred and Buffalo calves.