Insemination before and after the onset of heat in sows
Insemination before and after the onset of heat in sows
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母猪发情前后的授精
DOI：
10.1017/s0003356100034425
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发表时间：
1962
期刊：
影响因子：
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通讯作者：
G. Hovell
中科院分区：
文献类型：
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作者：
J. Hancock;G. Hovell
分别对3头配种母猪、7头配种母猪和34头授精母猪在发热前后不同时间的受精卵和未受精卵进行计数。在受热前一天（第1天）、受热第1天（第0天）、受热第2天（第1天）和受热第3天（第2天）受精的母猪，未固定和固定卵子的受精卵百分比分别为：第1天的7.1%和9.8%；55.9和68.8，第0天；第1天63·4和98·2；第2天，20.1和15.2。未交配母猪未记录受精卵；配种母猪的比例分别为94.3%和95.5%。因此，在发情期前和发情期后进行的授精，受精失败可能是生育力丧失的最大原因。在第1天和第2天受精的母猪，大部分卵子在透明带上没有精子。少数在第2天受精的母猪的卵子有大量的精子存在。这表明，精子到达受精点的失败，而不是他们的受精能力的丧失，很可能是早期人工授精低生育率的原因。
Counts were made before and after fixation of the numbers of fertilised and unfertilised ova recovered from 3 mated sows, 7 unmated sows and from 34 sows inseminated at varying times before and after the onset of heat. The percentages of fertilised ova for sows inseminated the day before heat (day — 1) on the first day of heat (day 0) the second day of heat (day 1) and the third day of heat (day 2) are respectively for unfixed and fixed ova: 7·1 and 9·8, day – 1 ; 55·9 and 68·8, day 0; 63·4 and 98·2, day 1; 20·1 and 15·2, day 2. No fertilised ova were recorded from unmated sows; the percentages for mated sows were 94·3 and 95·5. It is concluded that failure of fertilisation is likely to be the greatest source of loss of fertility in inseminations made before heat and late in heat. Most ova from sows inseminated on day — 1 and from sows inseminated in day 2 had no spermatozoa on the zona pellucida. A few ova from sows inseminated on day 2 had very large numbers of spermatozoa present. It is suggested that failure of the spermatozoa to reach the site of fertilisation rather than their loss of fertilising capacity is likely to be the cause of the low fertility of early inseminations.