八眉猪胴体物理组成的异速生长特性研究

A Study on Allometric Growth Characteristics of Carcass Physical Compositions of Bamei pigs

用异速方程Y=αX^b研究了48头八眉猪胴体物理组成的异速生长特性、及其性别和营养水平的影响。结果表明,八眉猪胴体物理组成的早熟顺序为骨骼>皮肤>肌肉>脂肪。皮肤组织的增长比值与胴体的增长比值相比较,后期较高,脂肪组织的增长比值后期上升较快,而肌肉组织的增长比值较小且后期下降较快,这是八眉猪胴体瘦肉率低而皮较厚的生长发育机制。同时发现,去势母猪脂肪组织的b值明显地(P<0.05)大于去势公猪,将日粮的消化能和粗蛋白质分别由13.02(MJ/kg)和14.25％降至11.89(MJ/kg)和12.15％,不会导致八眉猪胴体物理组成之异速生长模式的改变。

The allometric growth characteristics of carcass physical composition of 48 Bamei pigs, and the effects of sex and nutrient level upon them were studied using the allometric function Y = aXh. The results showed that the mature orders of carcass physical composition of Bamei pigs were bone>skin> meat>fat. As compared to those of carcass, the growth rate of skin tissue was higher in late stage, that of fat tissue rose rapidly, and that of meat tissue was lower and fell fast at the late stage of growth.This is the developing mach-anism of low percentage of lean meat and thick skin of Bamei pigs. Meanwhile it was also found that the allometric growth coefficient (b) (P<0.05) of fat tissue of spayed gilts was obviously higher than that of barrows. Also reducing the digestible energy and gross protein level of the diet from 13.01 MJXkg and 14.25% to 11.89 MJ/kg, and 12.15% respectively, will not result in changes in the allometric growth models of carcass physical composition of Bamei pigs