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Cattle Boards
Breeding / Calving Issues
Son/Mother breeding= bad?
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<blockquote data-quote="WalnutCrest" data-source="post: 1298568" data-attributes="member: 21715"><p>Palatability, like most other traits, isn't something that's obvious for several years after the breeding decision is made.</p><p></p><p>If a calf is heterozygous for traits A, B and C and that calf's dam is heterozygous for the same three traits ... and these are the three traits you want to get better in in a hurry ... and you breed son to dam ... you have a 25% chance of getting homo good or homo bad on any of the three traits and a 50% chance of keeping your heterozygous state in any of the three ... so ... statistically, if you did this pairing enough times to get 64 calves on the ground, statistically, you should have one calf who is homozygous for the three traits you want (1/4th x. 1/4th x. 1/4th = 1/64th).</p><p></p><p>However, if the dam and her son are already homozygous good for one of the three traits and are hetero in the other two, you only need 16 pairings to (statistically) guarantee you'll have one calf who's homozygous good for all three.</p><p></p><p>And, if son and dam are homozygous good for two of the traits, you just need four calves to get a homozygous good calf.</p><p></p><p>...good luck to you in your pairings.</p><p></p><p>PS --- Personally, I have no issues w/ son/dam matings, as long as the dam is in the very very top end of your cow-herd and her son was at the very very top end of his group of contemporaries. Otherwise, why bother...</p></blockquote><p></p>
[QUOTE="WalnutCrest, post: 1298568, member: 21715"] Palatability, like most other traits, isn't something that's obvious for several years after the breeding decision is made. If a calf is heterozygous for traits A, B and C and that calf's dam is heterozygous for the same three traits ... and these are the three traits you want to get better in in a hurry ... and you breed son to dam ... you have a 25% chance of getting homo good or homo bad on any of the three traits and a 50% chance of keeping your heterozygous state in any of the three ... so ... statistically, if you did this pairing enough times to get 64 calves on the ground, statistically, you should have one calf who is homozygous for the three traits you want (1/4th x. 1/4th x. 1/4th = 1/64th). However, if the dam and her son are already homozygous good for one of the three traits and are hetero in the other two, you only need 16 pairings to (statistically) guarantee you'll have one calf who's homozygous good for all three. And, if son and dam are homozygous good for two of the traits, you just need four calves to get a homozygous good calf. ...good luck to you in your pairings. PS --- Personally, I have no issues w/ son/dam matings, as long as the dam is in the very very top end of your cow-herd and her son was at the very very top end of his group of contemporaries. Otherwise, why bother... [/QUOTE]
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Son/Mother breeding= bad?
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