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<blockquote data-quote="Jeanne - Simme Valley" data-source="post: 82739" data-attributes="member: 968"><p>If several breeders reports a calf out of an AI sire born with a potential genetic defect, our breed association uses the sire on his daughters. If he is carrying a genetic defect - it WILL show up using his daughters. They breed a certain number of daughters - if they do not have a calf born with the defect - they clear the bull & let semen sold on him again.</p><p>So, if you breed a bull to daughters, like Dun said, if there is a recessive gene (a gene that does not get expressed in the calf unless the calf inherits the same gene from both mom & dad) that is a BAD gene - your offspring has a high probability to express the bad gene. This is not just genetic defects, it can be a health problem, it could be poor feet, structure, the list goes on & on.</p><p>Now, if there is this super bull, and he doesn't carry ANY poor recessive genes, you may be duplicating all his good genes.</p><p>I would prefer breeding 1/2 or 1/4 sibs. I guess that's linebreeding instead of inbreeding (father to daughter).</p></blockquote><p></p>
[QUOTE="Jeanne - Simme Valley, post: 82739, member: 968"] If several breeders reports a calf out of an AI sire born with a potential genetic defect, our breed association uses the sire on his daughters. If he is carrying a genetic defect - it WILL show up using his daughters. They breed a certain number of daughters - if they do not have a calf born with the defect - they clear the bull & let semen sold on him again. So, if you breed a bull to daughters, like Dun said, if there is a recessive gene (a gene that does not get expressed in the calf unless the calf inherits the same gene from both mom & dad) that is a BAD gene - your offspring has a high probability to express the bad gene. This is not just genetic defects, it can be a health problem, it could be poor feet, structure, the list goes on & on. Now, if there is this super bull, and he doesn't carry ANY poor recessive genes, you may be duplicating all his good genes. I would prefer breeding 1/2 or 1/4 sibs. I guess that's linebreeding instead of inbreeding (father to daughter). [/QUOTE]
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