Factors affecting the number of teats in pigs
Factors affecting the number of teats in pigs
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DOI：
10.1530/jrf.0.1150097
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发表时间：
1999-01-01
期刊：
影响因子：
--
通讯作者：
Arthur, RD
中科院分区：
文献类型：
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作者：
Drickamer, LC;Rosenthal, TL;Arthur, RD
影响猪产奶量的因素在生物学上和实践上都引起了人们的兴趣。先前的研究表明，这其中有遗传因素，主要来自大坝。一个窝中雄性的比例似乎与窝中后备母猪的肛门生殖器距离有关，可能是宫内位置效应的结果。本研究考察了产仔数、产仔性别比、肛门生殖器距离、冠臀长、颅底到尾底距离、公、母母猪产仔数对后备母猪产仔数的影响。对凋落物均值（调整后的r(2) = 0.178）进行逐步多元回归分析，结果表明：坝上产仔数（标准系数0.311）和雄性占产仔数的比例（标准系数-0.282）具有显著性。坝上的奶头数量越多，产仔中雄性的比例越低，后备母猪的奶头数量就越多。当以母猪个体为独立单位（调整后r(2) = 0.073）进行分析时，母猪栏头数（标准系数0.207）、公仔比例（标准系数-0.135）和母猪断奶重（标准系数0.083）均是母猪栏头数的显著预测因子。这一证据表明，母猪的产奶量与母猪窝中公猪的比例有关。
The factors that affect the number of teats in pigs are of interest for both biological and practical reasons. Previous work indicates that there is a genetic component, principally from the dam. The proportion of males in a litter appears to be related to the anogenital distance of the gilts in the litter, possibly as a result of the intrauterine position effect. The present study investigated whether Litter size, litter sex ratio, anogenital distance, crown-rump length, distance from base of skull to base of tail, and the number of teats on the dam and boar affected the number of teats on gilts. Stepwise multiple regression on litter mean values (adjusted r(2) = 0.178) indicated that two factors were significant: the number of teats on the dam (standard coefficient 0.311) and the proportion of males in the litter (standard coefficient -0.282). A greater number of teats on the dam and a lower proportion of males in the litter resulted in a greater number of teats on the gilt. When the analysis was run using individual gilts as the independent units (adjusted r(2) = 0.073), the number of teats on the dam (standard coefficient 0.207), the proportion of males in the litter (standard coefficient -0.135), and the weaning weight of the gilt (standard coefficient 0.083) were all significant predictors of the number of teats. This evidence suggests that teat number in female pigs is related to the proportion of males in the litter.