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Cattle Boards
Breeding / Calving Issues
Twins from a heifer
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<blockquote data-quote="shortybreeder" data-source="post: 1320830" data-attributes="member: 21626"><p>Well it wouldn't be the first incorrect thing my genetics professor taught us... but he's the head of the dairy department, so I assumed he would understand this at least. He explained it as being a male embryo splitting into two embryos, however in the second embryo, there is only a single X chromosome, and for whatever reason the Y chromosome doesn't come over. Hence why you would get male AND female "identical" twins. And the heifer would be a freemartin due to lacking a second X chromosome during critical developmental stages. That's just what I was taught last semester, but I had a few other issues with what he tried to tell us was "fact" in regards to cattle breeding...</p></blockquote><p></p>
[QUOTE="shortybreeder, post: 1320830, member: 21626"] Well it wouldn't be the first incorrect thing my genetics professor taught us... but he's the head of the dairy department, so I assumed he would understand this at least. He explained it as being a male embryo splitting into two embryos, however in the second embryo, there is only a single X chromosome, and for whatever reason the Y chromosome doesn't come over. Hence why you would get male AND female "identical" twins. And the heifer would be a freemartin due to lacking a second X chromosome during critical developmental stages. That's just what I was taught last semester, but I had a few other issues with what he tried to tell us was "fact" in regards to cattle breeding... [/QUOTE]
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