This paper discussed the physiology mechanism of prolificacy and reviewed the reasons and effectiveness of using placental efficiency as a selection tool for litter size and the relationship between placental efficiency and growth traits in pigs.
本文综述了猪高繁殖力的生理机制研究进展 ,对近年来关于猪胎盘效率与产仔数关系以及胎盘效率与生产性状间的关系研究进行了详细描述 ,从胎盘效率这一综合指标探讨猪高繁殖力的生理基础 ,目前的研究结果表明 ,基于胎盘效率的选择是提高猪的窝产仔数行之有效的方
The results of variance analysis indicated that litter size had extremely significant difference between populations,which showed that various populations had different genetic structure.
对二花脸猪、大白猪及其杂交一代和回交一代 4个群体共计 2 0 10窝产仔数的资料进行了加性—显性遗传模型以及基因效应的研究。
The relationship between placental efficiency and litter size, the number of live births, the number of stillborn , the mummified fetuses, litter weight at birth were compared.
研究结果表明: 1、在窝产仔数和产活仔数方面,低胎盘效率组(H_3)长大二元杂母猪的窝总产仔数极显著地低于中等胎盘效率组(H_2)和高胎盘效率组(H_1)(P<0。
The results indicated that the farrowing rate and number born per litter were not significantly different among AI, AI plus natural service (NS) and natural service.
结果表明 :全人工授精、人工授精同自然交配结合等配种方式与自然交配对照组相比 ,分娩率和窝均产仔数差异不显著 ;3至6胎母猪的分娩率高于其它胎次 ,而窝产活仔数 3至 5胎高于其它胎次 ,不同配种方式对各胎次母猪的分娩率和窝均产活仔数无显著影响 ;常温 (17℃ )保存 1d的精液输精后 ,与鲜精相比 ,母猪的分娩率和窝均产活仔数无显著差异 ;人工授精技术的应用使每头母猪每年多提供 3。
The correlation coefficients between PE and litter size,the number of live births were 0.
收集了1 059胎次的长白、大白、杜洛克、大花白和蓝塘猪5个品种母猪的胎盘效率,分析了胎盘效率与窝均总产仔数、窝均产活仔数的相关关系,估计了胎盘效率的遗传力。
Correlation analysis among number of littermate, weight at birth,weight at ablactating in Landrace Pigs;
测定西北农林科技大学教学试验农场种猪场健康、繁殖正常的147头长白母猪的窝产活仔猪数(X)、初生窝重(y1)、断奶窝重(y2),分别按照窝产活仔猪数分组进行方差分析和性状间的相关回归分析。
Effect of Cataract pills on the antibody level and fetiferous number of rats with positive anti-endometrial antibody
内障丸对抗子宫内膜抗体阳性大鼠抗体水平及窝产仔数的影响
Study on the Relationship of Swine Litter Size Alive and Uniformity of Newborn Piglets
母猪窝产活仔数与初生仔猪整齐度的相关性研究
This litter produced two males and seven females.
这一窝产下两只雄仔和七只雌仔。
Selection for litter size at day five to improve litter size at weaning and piglet survival rate
五日龄窝活仔数对窝断奶仔猪数及仔猪成活率的影响
A female rat may have five or six litter yearly, and an average of nine per litter
一只雌鼠每年可产幼仔五至六窝,平均每窝九只
A female rat may have five or six litters yearly, and an average of nine per litter.
一只雌鼠每年可产幼仔五至六窝,平均每窝九只。
This situation can give rise to delayed re-breeding and a high number of first litter animals culled for the reproductive failure.
这种状况下，会导致初产母猪发情延迟，由于繁殖力差而引起的第一胎窝仔猪淘汰数多。
The sows and litters were kept in the farrowing house until the pigs were about 9 to 14 days of age.
母猪和它的窝仔都被关在产房里直到仔猪9-14天年龄时。
This, in turn, has a significant impact on the transfer of nutrient from the sow to the piglets, thus affecting growth rate and health status of the litter.
随后，对营养从母体到仔猪的转运有明显的影响，因此影响窝产仔猪的生长速度和健康状况。
To give birth to(whelps or a whelp).
下（崽），产（仔）
An armpit.Often used in the plural.
腋窝腋窝，常用复数
Crossbred Duroc was not better than pure ones for litter size at birth.
系间杂交公猪所配母猪的产仔数也与纯系所配母猪的产仔数相近。
TNB and NBA of both Suzhong and Erhualian sows with 152/170 genotype are large.
二花脸猪和苏钟猪172／152基因型都有较高的总产仔数和产活仔数。
Effects of ob Gene on Litter Size in Swine;
ob基因对猪产仔数遗传效应的研究
Genetic analysis was conducted on the data of3 populations with1686 litters including Erhualian pig, Large White and first cross.
对二花脸猪、白猪及其杂交一代3个群体共计1686窝仔猪数的资料进行了遗传分析。
"Since the sow's gestation period is only four months, she can farrow two litters a year. New breeds are being developed rather rapidly."
由于猪的妊娠期只有4个月，1年可以产两窝猪仔。现在新品种的培育其实是相当快的。
One day I found a litter of wild kittens in our woodpile.
有一天，我在木柴堆上发现一窝野猫仔。
Studies of Related Molecule Marker on Litter Size and Parentage Test in Arctic Fox;
北极狐亲子鉴定及产仔数相关基因的研究