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Replacement females???
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<blockquote data-quote="Warren Allison" data-source="post: 1848193" data-attributes="member: 40587"><p>Whether the calf is terminal or retained , has nothing to do with whether the resulting son ( who is also a grandson) or the resulting daughter ( who is also a granddaughter) gets the genetic defect. The bull is heterozygous for the defect. Bred to a cow that has no copy of the gene, the resulting calf has a 50% of carrying that gene, and a 50% chance of being a non-carrier. Bred <em>back</em> to its sire, the calf with one copy of the defective gene has a 25% chance of having that defect...homozygous for the defective gene., 50% chance of being a carrier, and a 25% of being a non-carrier You are right, though, about the herd health thing. If you then bred <em>that </em>daughter- granddaughters <em>back</em> to that bull <em>again</em>, of the 75% that survive.... that don't have the defect... 2 out of 3 of them will be carriers.</p></blockquote><p></p>
[QUOTE="Warren Allison, post: 1848193, member: 40587"] Whether the calf is terminal or retained , has nothing to do with whether the resulting son ( who is also a grandson) or the resulting daughter ( who is also a granddaughter) gets the genetic defect. The bull is heterozygous for the defect. Bred to a cow that has no copy of the gene, the resulting calf has a 50% of carrying that gene, and a 50% chance of being a non-carrier. Bred [I]back[/I] to its sire, the calf with one copy of the defective gene has a 25% chance of having that defect...homozygous for the defective gene., 50% chance of being a carrier, and a 25% of being a non-carrier You are right, though, about the herd health thing. If you then bred [I]that [/I]daughter- granddaughters [I]back[/I] to that bull [I]again[/I], of the 75% that survive.... that don't have the defect... 2 out of 3 of them will be carriers. [/QUOTE]
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Replacement females???
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