与自由马丁孪生出生的公牛的生育力：综述
The fertility of bulls born twin to freemartins: a review.
作者信息
Long S E
出版信息
Vet Rec. 1979 Mar 10;104(10):211-3. doi: 10.1136/vr.104.10.211.
PMID:377775
Abstract
Evidence for the existence of XX germ cells in the testes of bulls born twin to females is reviewed. It is concluded that there is probably no shift in the sex ratio of the offspring in favour of females. Reports on the fertility of such bulls are reviewed. It is suggested that, provided the semen is normal, there is no reason why such a bull should not be used for breeding purposes.
摘要
对雌性孪生公牛睾丸中XX生殖细胞存在的证据进行了综述。得出的结论是，后代的性别比例可能不会向有利于雌性的方向转变。对这类公牛生育力的报告进行了综述。建议如果精液正常，没有理由不使用这样的公牛进行繁殖。
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