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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: 1040957" data-attributes="member: 8265"><p>Was looking at semen from a bull. Breeder had stopped selling it because they said it was tested for export, and found to have a translocation gene.</p><p></p><p>If I understand correctly from my reading, all the genes are normal, but just paired up slightly wrong in the chromosome, so 10 to 20% of embryos are aborted right away and the cow can be bred the next cyle or two. If that embryo is okay, they have a normal calf. So if have a bull running with herd, might not notice an extra breeding here or there, but if doing AI, would notice more.</p><p></p><p>The breeder says they haven't seen any decreased fertility in the bull's female offspring.</p><p></p><p>Looking for some perspective on this.</p><p>Has anyone dealt with this problem or is familiar with it? Just wondering how common it is, and if people worry about it. Also wondering which semen gets tested for it. Breeder said it is rarely tested for, so makes me wonder about other semen I have.</p><p></p><p>Here are a few links I came up with:</p><p></p><p><a href="http://homepage.usask.ca/~schmutz/chromosome.html" target="_blank">http://homepage.usask.ca/~schmutz/chromosome.html</a></p><p></p><p><a href="http://www.sciencedirect.com/science/article/pii/0093691X91904116" target="_blank">http://www.sciencedirect.com/science/ar ... 1X91904116</a></p><p></p><p><a href="http://pubs.aic.ca/doi/pdf/10.4141/cjas89-102" target="_blank">http://pubs.aic.ca/doi/pdf/10.4141/cjas89-102</a></p></blockquote><p></p>
[QUOTE="djinwa, post: 1040957, member: 8265"] Was looking at semen from a bull. Breeder had stopped selling it because they said it was tested for export, and found to have a translocation gene. If I understand correctly from my reading, all the genes are normal, but just paired up slightly wrong in the chromosome, so 10 to 20% of embryos are aborted right away and the cow can be bred the next cyle or two. If that embryo is okay, they have a normal calf. So if have a bull running with herd, might not notice an extra breeding here or there, but if doing AI, would notice more. The breeder says they haven't seen any decreased fertility in the bull's female offspring. Looking for some perspective on this. Has anyone dealt with this problem or is familiar with it? Just wondering how common it is, and if people worry about it. Also wondering which semen gets tested for it. Breeder said it is rarely tested for, so makes me wonder about other semen I have. Here are a few links I came up with: [url=http://homepage.usask.ca/~schmutz/chromosome.html]http://homepage.usask.ca/~schmutz/chromosome.html[/url] [url=http://www.sciencedirect.com/science/article/pii/0093691X91904116]http://www.sciencedirect.com/science/ar ... 1X91904116[/url] [url=http://pubs.aic.ca/doi/pdf/10.4141/cjas89-102]http://pubs.aic.ca/doi/pdf/10.4141/cjas89-102[/url] [/QUOTE]
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