Pregnancy and ovulation rates in Grey seals (Halichoerus grypus) on the British coast
Pregnancy and ovulation rates in Grey seals (Halichoerus grypus) on the British coast
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英国海岸灰海豹（Halichoerus grypus）的怀孕率和排卵率
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
I. Boyd
中科院分区：
文献类型：
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作者：
I. Boyd
本研究测定了两批英国灰海豹的妊娠率和排卵率，并描述了妊娠率和排卵率随年龄的变化。海豹采样从赫布里底群岛在1978年8月和1979年3月和1981年10月之间从名声群岛被使用。据估计，来自法梅群岛的成年雌性怀孕率为94- 29%，而来自赫布里底群岛的海豹为82-95%。这些数值无显著差异。通过直接观察孕体估计的妊娠率与通过卵巢中是否存在白体估计的妊娠率相当。到4岁及4岁以上（4岁以上），即成年时，50%的女性怀孕。从5岁以上开始，怀孕率保持不变。性成熟年龄低于平均年龄的女性怀孕率低于年龄较大的女性。
This study determined the pregnancy and ovulation rates in two stocks of Grey seals from Britain and described changes in pregnancy and ovulation rate with age. Seals sampled from the Hebrides during August 1978 and from the Fame Islands between March 1979 and October 1981 were used. Adult female pregnancy rate in the stock from the Fame Islands was estimated to be 94–29%, compared with 82–95% for seals from the Hebrides. These values were not significantly different. Pregnancy rate estimated by direct observation of a conceptus was comparable with an estimate from the presence or absence of corpora albicantia in the ovaries. By the age of four years and over (4 +), i.e. at maturity, 50% of females became pregnant. Pregnancy rate remained constant from age 5 + onwards. Pregnancy rate amongst females which became sexually mature at a younger than average age was lower than in older age classes.