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Cattle Boards
Breeding / Calving Issues
An interesting article
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<blockquote data-quote="ANAZAZI" data-source="post: 1231038" data-attributes="member: 7541"><p>Nothing new under the sun. By measuring the bulls own fertility as AI success rate, we have long ago identified those bulls free of deleterious alleles that cause embryonic death loss. By "we" I refer to the breeding organisations for the nordic breeds of dairy/dual Ayrshire type. This data collection has been done for decades already. The thing is if a bull is free from, or has few such alleles, it does not matter much if the cow has them, so by using bulls with high AI success rate, these genetics have become very scarce in these breeds. This method does not identify each gene, but on the other hand it works equally well for identified and not identified alleles. </p><p>Kind of like when you inbreed a bull to a number of his daughters to identify carriers of certain syndromes like snorter dwarfs or CVM, you know a clean bull is clean for all deleterious alleles. If you test a bull for a specific syndrome you know nothing about what else he carries. :2cents:</p></blockquote><p></p>
[QUOTE="ANAZAZI, post: 1231038, member: 7541"] Nothing new under the sun. By measuring the bulls own fertility as AI success rate, we have long ago identified those bulls free of deleterious alleles that cause embryonic death loss. By "we" I refer to the breeding organisations for the nordic breeds of dairy/dual Ayrshire type. This data collection has been done for decades already. The thing is if a bull is free from, or has few such alleles, it does not matter much if the cow has them, so by using bulls with high AI success rate, these genetics have become very scarce in these breeds. This method does not identify each gene, but on the other hand it works equally well for identified and not identified alleles. Kind of like when you inbreed a bull to a number of his daughters to identify carriers of certain syndromes like snorter dwarfs or CVM, you know a clean bull is clean for all deleterious alleles. If you test a bull for a specific syndrome you know nothing about what else he carries. :2cents: [/QUOTE]
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Breeding / Calving Issues
An interesting article
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