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<blockquote data-quote="cbcr" data-source="post: 1652671" data-attributes="member: 16303"><p>It would be difficult to say how many "carrier" cows are in commercial herds. Some registered breeders also have a commercial herd so if a cow is tested as a carrier and if she raises a good calf, many will move that cow into the commercial herd. Or if a carrier cow is taken to the sale barn and is open and she would happen to fit into someone else's program she goes to someone else's farm and they don't know they purchased a carrier.</p><p></p><p>Another way that a commercial producer can end up with cows that are carriers is if they bought a bull that was used a few generations back and a new defect is discovered and that bull used has a good possibility of being a carrier.</p><p></p><p>How many cows that have an unknown status have been used in breeding up programs with other breeds?</p><p></p><p>Some breeds have strict guidelines when it comes to defects and others could care less. Dairy breeds seem not not care about trying to eliminate defects. We have seen many times in the process of registering animals where for 3 generations that defect sires were used. For many breeders knowing what animals are carriers and what their defects are for some is not easily found. </p><p></p><p>One thing that we do is if we find out that an animal is a carrier of a defect we put an * at the end of their name. This helps breeders know that their is a carrier animal in the pedigree. It is surprising though as to how many breeders don't seem to care, that is until they happen to have issues in their herd, and then even if they knew the defect status they still want to blame someone else!</p></blockquote><p></p>
[QUOTE="cbcr, post: 1652671, member: 16303"] It would be difficult to say how many "carrier" cows are in commercial herds. Some registered breeders also have a commercial herd so if a cow is tested as a carrier and if she raises a good calf, many will move that cow into the commercial herd. Or if a carrier cow is taken to the sale barn and is open and she would happen to fit into someone else's program she goes to someone else's farm and they don't know they purchased a carrier. Another way that a commercial producer can end up with cows that are carriers is if they bought a bull that was used a few generations back and a new defect is discovered and that bull used has a good possibility of being a carrier. How many cows that have an unknown status have been used in breeding up programs with other breeds? Some breeds have strict guidelines when it comes to defects and others could care less. Dairy breeds seem not not care about trying to eliminate defects. We have seen many times in the process of registering animals where for 3 generations that defect sires were used. For many breeders knowing what animals are carriers and what their defects are for some is not easily found. One thing that we do is if we find out that an animal is a carrier of a defect we put an * at the end of their name. This helps breeders know that their is a carrier animal in the pedigree. It is surprising though as to how many breeders don't seem to care, that is until they happen to have issues in their herd, and then even if they knew the defect status they still want to blame someone else! [/QUOTE]
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