Received: 19-08-2020 / Accepted: 10-09-2020
This study aimed to determine the best model to explain the growth curve of F1(BBB x Lai Sind) bulls using non-linear function models such as Logistic, von Bertalanffy, Gompertz, Brody, and Negative Exponential. For this purpose, live weight records of a total 60 F1(BBB x Lai Sind) consisted of 30 bulls and 30 heifers, reared in Ba Vi district, Hanoi city were used. In order to select the best model, the coefficient of determination (R2) and parameters of ME, MSE, MAE, MPE, MAPE were utilized. Results showed that, in both bulls and heifers, von Bertalanffy and Brody functions had the highest R2 and lowest ME, MSE, MAE, MPE, MAPE; followed by Gompertz function. Logistic and Negative Exponential functions had lower values of the above parameters. Age and body weight at the inflection point ranged from 15.47 to 20.41 months; and 400.13 to 415.44kg for bulls; 10.05-14.29 months and 255-276.27kg for heifers, respectively. Therefore, von Bertalanffy function is recommended to use for prediction of live weight on the age of F1(BBB x Lai Sind).