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Breeding / Calving Issues
? bout free martin?
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<blockquote data-quote="Fire Sweep Ranch" data-source="post: 1224103" data-attributes="member: 18809"><p>I am not sure if I understand what you are saying here. A freemartin heifer is just like a regular heifer genetically, but her repro tract was not developed due to the testosterone from the bull calf forming (so environmental cause, not genetics). She has a sire and a dam. In the very unusual case when you get one that does have a fully functional repro tract, and she can have a calf, that calf is dammed by her and sired by the bull, so genetically has a sire and a dam. </p><p>So why am I having a hard time understanding the resulting calf would have two fathers and no mothers? I usually follow your thinking CP, but having a hard time here with this one, and I know you have a ton of experience in this.</p><p></p><p>And speaking of freemartin females that can have a calf, has anyone figured out WHY it happens? I know why the repro tract does not form, so what prevents the testosterone from the male twin from crossing over the placental membrane in the very few cases of fertile freemartin heifers?</p></blockquote><p></p>
[QUOTE="Fire Sweep Ranch, post: 1224103, member: 18809"] I am not sure if I understand what you are saying here. A freemartin heifer is just like a regular heifer genetically, but her repro tract was not developed due to the testosterone from the bull calf forming (so environmental cause, not genetics). She has a sire and a dam. In the very unusual case when you get one that does have a fully functional repro tract, and she can have a calf, that calf is dammed by her and sired by the bull, so genetically has a sire and a dam. So why am I having a hard time understanding the resulting calf would have two fathers and no mothers? I usually follow your thinking CP, but having a hard time here with this one, and I know you have a ton of experience in this. And speaking of freemartin females that can have a calf, has anyone figured out WHY it happens? I know why the repro tract does not form, so what prevents the testosterone from the male twin from crossing over the placental membrane in the very few cases of fertile freemartin heifers? [/QUOTE]
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? bout free martin?
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