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<blockquote data-quote="simme" data-source="post: 1807588" data-attributes="member: 40418"><p>GAR Precision 1680 is still in the database, but it does show that he is a carrier of AM and NH. Lots of use with BW and WW data submitted on over 8000 progeny.</p><p></p><p>Correct me if I am wrong, but the use of AI bulls vs walking bulls does not necessarily mean an increased risk of a genetic issue. Genetic defects can naturally originate in an animal or can be inherited from one or both parents. Stands to reason that a bull with heavy use has a higher risk of a defect presenting itself in progeny - not due to the fact that he has AI use, but from the fact that more progeny/use increases the probability of detection (not existence) of the defect. A bull purchased for in herd natural use could have a genetic mutation/defect that is never detected. But he might be spreading that defect in half his calves who also spread the defect for years. </p><p></p><p>Take two scenarios - an AI bull with heavy use that has a defect which is soon detected, a test developed, and an effort to locate and remove the defective animals is underway. Or a natural service bull that sires 50 calves per year - half carrying the defect. 5 calves kept and sold as breeding stock each year. Which scenario presents the higher risk long term?</p></blockquote><p></p>
[QUOTE="simme, post: 1807588, member: 40418"] GAR Precision 1680 is still in the database, but it does show that he is a carrier of AM and NH. Lots of use with BW and WW data submitted on over 8000 progeny. Correct me if I am wrong, but the use of AI bulls vs walking bulls does not necessarily mean an increased risk of a genetic issue. Genetic defects can naturally originate in an animal or can be inherited from one or both parents. Stands to reason that a bull with heavy use has a higher risk of a defect presenting itself in progeny - not due to the fact that he has AI use, but from the fact that more progeny/use increases the probability of detection (not existence) of the defect. A bull purchased for in herd natural use could have a genetic mutation/defect that is never detected. But he might be spreading that defect in half his calves who also spread the defect for years. Take two scenarios - an AI bull with heavy use that has a defect which is soon detected, a test developed, and an effort to locate and remove the defective animals is underway. Or a natural service bull that sires 50 calves per year - half carrying the defect. 5 calves kept and sold as breeding stock each year. Which scenario presents the higher risk long term? [/QUOTE]
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