中国瘦肉型猪新品系DⅥ号系的乳头性状初探

A preliminany study on teat trait in pigs of chinese lean-type line DⅥ:

本文以ＤⅥ号母本为主要研究对象，对不同品种或不同胎次间后代的乳头数与产活仔数、３５日龄数、断奶个体重进行了测定分析。ＤⅥ号母本猪６．９２对的测定表明，乳头数多者产活仔数和３５天断奶成活数高。第二胎后代断乳头数比第一、三胎多；随选育世代增加，其后代乳头数及产活仔数、３５天断奶数，均略有下降。随着亲本猪乳头数均值提高，其产活仔数、３５天断奶时仔猪成活数、个体重均有所提高。

An analysis has been made on the relationship between teat numbers and litter size,piglet numbers at 35 day and piglet weight at weaning in DⅥ female line. Results show that the sows have 6.92 pairs of teats for each. The sows with more teats produce larger litters and the survival rates. The progeny from parity 2 of sows has more teats than that from parity 1 and 3. As the selection generation is advanced, the nunbers of teats, piglets born alive and piglets at weaning tend to decrease slightly. With the rise of teat number in parents, the sow's reproductive performance becomes better.