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How to breed out black coat color
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<blockquote data-quote="TexasJerseyMilker" data-source="post: 1849701" data-attributes="member: 42782"><p>Thank you for this advice. I know the bull was hetero for black. So, he had a red gene and a black gene in his chromosome pairs. He was black because the black gene dominated. Daphne, the original mother cow, has only red chromosome pairs. Red is recessive. </p><p></p><p> I'm trying to picture this.</p><p> Each parent splits their chromosome pair and contributes one strand of chromosome to fertilize the egg. Red cow could only contribute recessive red genes. The bull could either contribute black or red. He contributed black so it dominated and Lily of Valley is black but she carries recessive red.</p><p></p><p>The next calf from that same pairing was red (fawn). That's because this time the bull donated a a red chromosome. Unfortunately that heifer did not live.</p><p></p><p>So . . . Lily of the Valley is heterozygous black. She has a black coat and carries a red coat gene. Bred AI to a homozygous Jersey bull that can only contribute red genes, that calf's color will depend on if she threw a red or a black gene.</p><p></p><p>So, its a 50/50 chance her Lily of Valley daughter could be red.</p><p>If it was a red heifer she would be homozygous for red and could only have red calves if bred to Jersey bulls. That is what I'm looking for. I have Factor D (determination)</p><p></p><p>Yes it would be cheaper, quicker and less trouble to just buy another bottle heifer from a dairy. But she would not be related to Daphne. Am I sentimental? Heck yes.</p></blockquote><p></p>
[QUOTE="TexasJerseyMilker, post: 1849701, member: 42782"] Thank you for this advice. I know the bull was hetero for black. So, he had a red gene and a black gene in his chromosome pairs. He was black because the black gene dominated. Daphne, the original mother cow, has only red chromosome pairs. Red is recessive. I'm trying to picture this. Each parent splits their chromosome pair and contributes one strand of chromosome to fertilize the egg. Red cow could only contribute recessive red genes. The bull could either contribute black or red. He contributed black so it dominated and Lily of Valley is black but she carries recessive red. The next calf from that same pairing was red (fawn). That's because this time the bull donated a a red chromosome. Unfortunately that heifer did not live. So . . . Lily of the Valley is heterozygous black. She has a black coat and carries a red coat gene. Bred AI to a homozygous Jersey bull that can only contribute red genes, that calf's color will depend on if she threw a red or a black gene. So, its a 50/50 chance her Lily of Valley daughter could be red. If it was a red heifer she would be homozygous for red and could only have red calves if bred to Jersey bulls. That is what I'm looking for. I have Factor D (determination) Yes it would be cheaper, quicker and less trouble to just buy another bottle heifer from a dairy. But she would not be related to Daphne. Am I sentimental? Heck yes. [/QUOTE]
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