高原瘦肉型猪乳头数遗传规律的研究

Study on Genetic Regularity of nipple number of plateau lean-meat sow

本文对高原瘦肉型猪选育群各世代的乳头数的遗传规律进行了分析研究,发现在选育过程中乳头数均值有增加的趋势;其对称性约为0.5∶1,乳头数出现的最高频率由互助猪的12枚上升到三、四世代的14枚,其遗传力为0.415,属中等遗传力。从乳头数均值与繁殖性状的相关关系来看,注重乳头数的选择,有利于乳头数均值的提高,从而促进繁殖性状的提高。

This study focused on the genetic regularity of nipple number of plateau lean-meat sow, with generation of selective herds as dependant variable. Result showed that the average nipple number inclined to be increasing with the proceeding of selection. The symmetry of nipples during selection was 0.5 ： 1. The highest frequency of nipple presence increased from 12 （Huzhu sow） to 14（the third and forth generation of plateau lean-meat sow）,with a medium heritability, which was 0.415. The correlation between average nipple number and reproductive characterisics indicated that the selection of nipple number redound to increase the average nipple number of sow, and hence promote the reproductive oerformance.