苏农黑猪生长特征和采食行为分析及其性别差异比较OA北大核心CSTPCD

This article aims to study the growth and development patterns of Sunong black pigs.In this study,30 barrows and 30 gilts of the Sunong black pig breed,each weighing approximately 35 kg,and aged at approximately 102 days,were selected and randomly assigned to three pens with 10 pigs per pen based on their gender.The experiment continued until the pigs reached a weight of around 110 kg each.Then,their growth performance and feeding behavior related indicators were obtained by the Pig Performance Testing Station.The investiga-tion focused on the growth and developmental patterns,and gender differences of the pigs,involving fitting growth curves and nutrient intake curves with multiple functions.The results as follows:The average days to of the barrows growing to 110 kg of body weight were significantly lower than those of the corresponding gilts(P＜0.05).Their average daily weight gain and average daily feed intake were significantly higher(P＜0.01).Their average daily feeding time was significantly higher,too(P＜0.01).The von Bertalanffy model used on the pigs fitted best,with the growth inflexion of time,the growth inflexion of the breast muscle weight,and the maximum daily gain for the barrows and gilts being 126 days,50.931 kg,0.764 kg,and 111 days,41.791 kg,0.752 kg,respectively.The curves of their digestible energy and crude protein intake showed that the ExpDec1 model provided the best fit,and the predicted values were higher than those in nutrient requirements of Swine.Compared with the gilts,the predicted nutritional requirements for the barrows were higher.Taken together,the growth performance of the barrows was superior to that of the gilts.The von Bertalanffy model better predicted the growth and development of the Sunong black pigs,while the ExpDec1 model better predicted the energy and protein intake of the pig breed.