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Breeding / Calving Issues
Bull with translocation gene, semen testing questions
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<blockquote data-quote="djinwa" data-source="post: 1041271" data-attributes="member: 8265"><p>Sure seems like it would be cheaper to test more bulls in the first place instead of culling later - especially the high use, AI bulls.</p><p></p><p>Again, I suppose if this is a very rare thing, might not be worth testing, but if rarely test, maybe its more common than we think.</p><p></p><p>As far as culling, the one article mentions with certain management practices, the lower fertility might not be noticed. And the breeder said they've seen no decreased fertility, so haven't culled anything. We know there has to be delayed calving occasionally, but whether it is significant enough to be noticed is the problem. If a cow is a cycle or two later than would be otherwise, breeder might either not notice, or attribute it to other factors like hot weather or something.</p><p></p><p>I don't plan to use the bull, but now I'm wondering since few bulls are tested, what are the odds of the untested ones having the problem. I might call some genetics guys and see what the latest is.</p><p></p><p>The article from 1989 said this about the incidence:</p><p></p><p>"The translocation has primarily been found</p><p>in the European continental breeds of beef</p><p>cattle and rarely in the British breeds. The</p><p>incidence of the translocation is not well</p><p>documented in Canada but McWhir et al.</p><p>(1987) found 2.5% of the beef cattle they</p><p>studied in Alberta to carry the 1;29 translocation</p><p>and Bongso and Basrur (1916) reported</p><p>it in Guernsey cattle in Ontario. We have</p><p>found several beef bulls with the translocation</p><p>in Saskatchewan as well (unpub. data)."</p><p></p><p>DJ in WAshington</p></blockquote><p></p>
[QUOTE="djinwa, post: 1041271, member: 8265"] Sure seems like it would be cheaper to test more bulls in the first place instead of culling later - especially the high use, AI bulls. Again, I suppose if this is a very rare thing, might not be worth testing, but if rarely test, maybe its more common than we think. As far as culling, the one article mentions with certain management practices, the lower fertility might not be noticed. And the breeder said they've seen no decreased fertility, so haven't culled anything. We know there has to be delayed calving occasionally, but whether it is significant enough to be noticed is the problem. If a cow is a cycle or two later than would be otherwise, breeder might either not notice, or attribute it to other factors like hot weather or something. I don't plan to use the bull, but now I'm wondering since few bulls are tested, what are the odds of the untested ones having the problem. I might call some genetics guys and see what the latest is. The article from 1989 said this about the incidence: "The translocation has primarily been found in the European continental breeds of beef cattle and rarely in the British breeds. The incidence of the translocation is not well documented in Canada but McWhir et al. (1987) found 2.5% of the beef cattle they studied in Alberta to carry the 1;29 translocation and Bongso and Basrur (1916) reported it in Guernsey cattle in Ontario. We have found several beef bulls with the translocation in Saskatchewan as well (unpub. data)." DJ in WAshington [/QUOTE]
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