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Breeding / Calving Issues
Freemartins
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<blockquote data-quote="whitecow" data-source="post: 677525" data-attributes="member: 8638"><p>I don't think Freemartins are caused by genes. They are caused by antimullerian hormone. All fetuses, in effect, start out as female. Male fetuses begin secreting antimullerian hormone which prevents development of the female reproduct tract. Because bovine fraternal twins (unlike human) share the same amniotic sac, the female fetus is exposed to the hormone secreted from the male. The result can be anything from not having a repro tract at all, to the very rare event of having a normal repro system. </p><p></p><p>At any rate.....time won't cure it!</p></blockquote><p></p>
[QUOTE="whitecow, post: 677525, member: 8638"] I don't think Freemartins are caused by genes. They are caused by antimullerian hormone. All fetuses, in effect, start out as female. Male fetuses begin secreting antimullerian hormone which prevents development of the female reproduct tract. Because bovine fraternal twins (unlike human) share the same amniotic sac, the female fetus is exposed to the hormone secreted from the male. The result can be anything from not having a repro tract at all, to the very rare event of having a normal repro system. At any rate.....time won't cure it! [/QUOTE]
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