Seasonal reproductive inefficiency in large pig breeding units in Britain
Seasonal reproductive inefficiency in large pig breeding units in Britain
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英国大型养猪场季节性繁殖效率低下
DOI：
10.1136/vr.104.3.49
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发表时间：
1979
影响因子：
2.2
通讯作者：
M. Stork
中科院分区：
文献类型：
--
作者：
M. Stork
对5个大型集约化种猪单位的繁殖性能进行了930天的监测。在此期间，出现了三个繁殖效率低下的时期，这些时期主要涉及在夏季的7月和8月饲养的动物。这种低效率的表现是发情期的恢复，流产和动物达到95天的推定妊娠期。这表明，环境温度胁迫，一个迄今为止尚未确定的树木因素，以及季节性的低密度趋势可能是促成因素。
The reproductive performance of five large, intensive pig breeding units was monitored over a period of 930 days. During this time three periods of reproductive inefficiency were noted, these mainly involving animals served during the summer months of July and August. Manifestations of this inefficiency were returns of oestrus, abortions and animals reaching 95 days of presumed gestation not-in-pig. It is suggested that ambient temperature stress, a hitherto unidentified arbortifacient factor, and a seasonal tendency towards suboestrus may have been contributory factors.