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Cattle Boards
Breeding / Calving Issues
Twins from a heifer
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<blockquote data-quote="shortybreeder" data-source="post: 1320749" data-attributes="member: 21626"><p>I thought freemartins were only in identical twins? And that a freemartin was the result of a split male embryo where only the X chromosome was transferred into the freemartin heifer, and as such they were freemartins because they didn't have the second X chromosome. So in this case, since we know they are not identical, if there is a male and female calf, couldn't one assume that the female is not actually a freemartin, but is actually a normal heifer?</p><p></p><p>Or in an odd case, they could be identical but when the heterozygous black bull embryo split, not all of the genes transferred over, resulting in a twin lacking the Y chromosome and the gene that would code for black, but still had the X chromosome and a gene that codes for red.</p></blockquote><p></p>
[QUOTE="shortybreeder, post: 1320749, member: 21626"] I thought freemartins were only in identical twins? And that a freemartin was the result of a split male embryo where only the X chromosome was transferred into the freemartin heifer, and as such they were freemartins because they didn't have the second X chromosome. So in this case, since we know they are not identical, if there is a male and female calf, couldn't one assume that the female is not actually a freemartin, but is actually a normal heifer? Or in an odd case, they could be identical but when the heterozygous black bull embryo split, not all of the genes transferred over, resulting in a twin lacking the Y chromosome and the gene that would code for black, but still had the X chromosome and a gene that codes for red. [/QUOTE]
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Twins from a heifer
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