摘要
观察大约克夏母猪１０个胎次，每胎次４０窝，发现其断奶至发情配种天数，从第九胎开始有明显减少；产仔数从第八胎开始明显降低；产活仔数、初生窝重从第七胎开始明显下降；断奶数及断奶窝重从第六胎开始明显降低。因此，大约克夏母猪的淘汰。
According to the observations on 40 litters in ten births of Large Yorkshire sows, the period from weaning to oestrus began to shorten remarkably at the ninth birth. The litter size began to decrease remarkably at the eighth birth. The live litter size and litter weight at birth began to decrease remarkably at the seventh birth. The litter size and litter weight at weaning began to decrease remarkably at the sixth birth. Therefore, Large Yorkshire Sows should be eliminated after their sixth birth.
出处
《江西农业学报》
CAS
1997年第2期7-10,共4页
Acta Agriculturae Jiangxi
关键词
猪
大约克夏
繁殖性能
胎次
母猪
Large Yorkshire Sows
Reproductive performance
Birth
