Received: 24-08-2020 / Accepted: 10-09-2020
This study was conducted to describe the growth and determine the best growth models to estimate body weight and average daily gain (ADG) of stress-negative Piétrain pigs raised in Dong Hiep livestock farm, Hai Phong province and animal farm of Vietnam National University of Agriculture from December 2007 to December 2015. Four functional growth Logistic, von Bertalanffy, Gompertz and Richards models were be used to estimate body weight, ADG of Piétrain pigs at birth (1198 intact male and 1141 gilts), weaning (808 intact maleand 773 gilts), 60 days (472 intact male and 483 gilts), 5.5 months (94 intact maleand 108 gilts), 7.5 months (228 intact male and 292 gilts). Richards, Gompertz functions had the highest coefficient of determination (0.968 and 0.966) and the lowest AIC (16813 and 17498), residual variance (23,6633 and 30,4267). Average daily gain from 60 days to 7.5 months of intact male (487 and 492 g per day) and gilts (493 g per day) were predicted by Richards, Gompertz similar an actual ADG. The growth of stress-negative Piétrain pigs can be well described withthe Richards and Gompertz functions.