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<blockquote data-quote="Brandonm22" data-source="post: 737915" data-attributes="member: 7645"><p>Any time you use a carrier bull (whether you know it or not) you are propogating that defect into your herd. Half of his calves will be carriers. From a practical standpoint, crossbreeding severely limits the likelihood of it ever actually surfacing in an economically destructive way. Somebody in a three breed rotational crossbreeding scenario is highly unlikely to ever get a calf that is homozgous for a recessive defect. Mathematically it COULD happen but the probablility is getting so small as to really not be a concern. If you went one step farther and were careful to use outcrosses to the bulls of that breed you used previously in the rotation, you could just about eliminate the possibility of homzygous calves being born. From a practical standpoint, the industry could eliminate these kinds of problems if we would establish testing herds where young AI sires were bred back to their daughters. I am completely at a loss as to why the big four AI companies aren't doing this. They could probably find a a large commercial ranch that would do the testing for them for $5000 at tax time (or Christmas) and the cost of the AIing.</p></blockquote><p></p>
[QUOTE="Brandonm22, post: 737915, member: 7645"] Any time you use a carrier bull (whether you know it or not) you are propogating that defect into your herd. Half of his calves will be carriers. From a practical standpoint, crossbreeding severely limits the likelihood of it ever actually surfacing in an economically destructive way. Somebody in a three breed rotational crossbreeding scenario is highly unlikely to ever get a calf that is homozgous for a recessive defect. Mathematically it COULD happen but the probablility is getting so small as to really not be a concern. If you went one step farther and were careful to use outcrosses to the bulls of that breed you used previously in the rotation, you could just about eliminate the possibility of homzygous calves being born. From a practical standpoint, the industry could eliminate these kinds of problems if we would establish testing herds where young AI sires were bred back to their daughters. I am completely at a loss as to why the big four AI companies aren't doing this. They could probably find a a large commercial ranch that would do the testing for them for $5000 at tax time (or Christmas) and the cost of the AIing. [/QUOTE]
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