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Blood/DNA test to detect a free martin
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<blockquote data-quote="milkmaid" data-source="post: 928382" data-attributes="member: 852"><p>Freemartinism occurs in cattle because of fusion between the heifer's placenta and bull's placenta. Fusion does not occur in species such as horses, goats, sheep, dogs, cats, pigs, etc even though the offspring may be mixed male/female, because the placentas do not fuse. In cattle, fusion results in the heifer being affected by the bull calf's hormones (produced earlier in gestation) and her reproductive tract regresses - severity differs between cases.</p><p></p><p>I don't believe the freemartin actually has DNA from the bull twin; an animal's DNA is set when fusion of egg and sperm happens. The freemartin does have abnormal hormone levels compared to a normal heifer (because she has been affected by specific male hormones from the bull calf), which is what the blood test is checking for.</p><p></p><p>If she cycles, settles, calves - she is not a freemartin.</p><p></p><p>All our cattle have 2 chromosomes - XX (female) or XY (male). Any animal that is XXY, XYY, XXX, etc has some serious problems. Humans with three chromosomes have major problems too - google it.</p></blockquote><p></p>
[QUOTE="milkmaid, post: 928382, member: 852"] Freemartinism occurs in cattle because of fusion between the heifer's placenta and bull's placenta. Fusion does not occur in species such as horses, goats, sheep, dogs, cats, pigs, etc even though the offspring may be mixed male/female, because the placentas do not fuse. In cattle, fusion results in the heifer being affected by the bull calf's hormones (produced earlier in gestation) and her reproductive tract regresses - severity differs between cases. I don't believe the freemartin actually has DNA from the bull twin; an animal's DNA is set when fusion of egg and sperm happens. The freemartin does have abnormal hormone levels compared to a normal heifer (because she has been affected by specific male hormones from the bull calf), which is what the blood test is checking for. If she cycles, settles, calves - she is not a freemartin. All our cattle have 2 chromosomes - XX (female) or XY (male). Any animal that is XXY, XYY, XXX, etc has some serious problems. Humans with three chromosomes have major problems too - google it. [/QUOTE]
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Blood/DNA test to detect a free martin
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