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Cattle Boards
Breeding / Calving Issues
Freemartins
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<blockquote data-quote="whitecow" data-source="post: 677578" data-attributes="member: 8638"><p>I think what the blood test actually identifies is an antigen (H-Y) to the bull's Y-chromosome, since the twins shared their blood supply. The heifer's chromosomal DNA is still XX. And it's the hormones produced by the Sertoli cells in the male fetal testes that cause the problem. But, heck, it wouldn't be the first time I've been wrong! And my mouth is too big for it to be the last....</p></blockquote><p></p>
[QUOTE="whitecow, post: 677578, member: 8638"] I think what the blood test actually identifies is an antigen (H-Y) to the bull's Y-chromosome, since the twins shared their blood supply. The heifer's chromosomal DNA is still XX. And it's the hormones produced by the Sertoli cells in the male fetal testes that cause the problem. But, heck, it wouldn't be the first time I've been wrong! And my mouth is too big for it to be the last.... [/QUOTE]
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