AN EPIDEMIOLOGIC INVESTIGATION OF REDUCED 2ND-LITTER SIZE IN SWINE
AN EPIDEMIOLOGIC INVESTIGATION OF REDUCED 2ND-LITTER SIZE IN SWINE
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DOI：
10.1016/0167-5877(92)90065-n
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发表时间：
1992-01-01
影响因子：
2.6
通讯作者：
ROBINSON, RA
中科院分区：
文献类型：
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作者：
MORROW, WEM;LEMAN, AD;ROBINSON, RA
本研究旨在确定第二升大小的减少是否与母猪遗传学、经产母猪的断奶至服务间隔或其他被认为影响产仔数的协变量相关。使用协方差分析对135个牛群的数据库进行了回顾性分析。 在135个猪群中，40%的猪群在第二窝中的活产猪数比第一窝少。 较大的第一窝产仔数是第二窝活产猪较少的主要决定因素。 基于最小二乘均值，13个母猪遗传组中有6个组的第二窝活产猪数少于第一窝;然而，差异取决于断奶至服务间隔。 较短的哺乳期长度和沉重的平均断奶仔猪体重与较少的猪出生活在第二窝比第一。 总之，延迟断奶后经产大白（或约克郡）×长白猪的繁殖与第二窝活产猪数量的增加有关。
This study was designed to determine if reduced second-liter size is associated with sow genetics, weaning-to-service interval for primiparous sows, or other covariates thought to influence litter size, A database of 135 herds was analyzed retrospectively using analysis of covariance. Of the 135 herds, 40% had fewer pigs born alive in their second litter than in the first. A large first-litter size was the major determinant of fewer pigs being born alive in the second litter. Based on least-squares means, 6 out of 13 sow genetic groups had fewer pigs born alive in the second litter than in the first; however, the difference depended on the weaning-to-service interval. A short lactation length and a heavy average weaned pig weight was associated with fewer pigs born alive in the second litter than in the first. In conclusion, delaying the breeding of primiparous Large-White (or Yorkshire) x Landrace sows post-weaning was related to an increased number of pigs born alive in their second litter.