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Breeding / Calving Issues
Breeding bull to daughters
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<blockquote data-quote="Ebenezer" data-source="post: 1822952" data-attributes="member: 24565"><p><a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8207663/" target="_blank">Angus genetic study</a> More than you likely want to know but it ties in IBC with pedigree, genomics and something else that escapes my brain without going back up in the study. I will do that later. But it is an interesting study if you work off of facts. What is most interesting to me in the traits that are noted as issues of inbreeding depression/regression - the traits that are of concern are many of the traits included in the $M index. Then the fad is to look at both $M and $C and those two cover all of the researched (this paper) depressed traits! So, maybe there is a reason to chase those indices to the tops of the charts! </p><p></p><p>The recent mutations in Angus, in my opinion, were extremely bad because the initial users and maybe the promoters of the sires did not note or tell of the defects early on. To me, that would have been the right thing to do. We had Angus in the 60's and occasionally a dwarf was born. You reported it and that was that... if you were honest! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite21" alt=":sneaky:" title="Sneaky :sneaky:" loading="lazy" data-shortname=":sneaky:" /> </p><p></p><p>The unspoken of inbreeding is the issue of prepotency of an individual in a population and how it effects inbreeding depression. And there is the Bulmer effect that has another angle on inbreeding issues if you study that.</p></blockquote><p></p>
[QUOTE="Ebenezer, post: 1822952, member: 24565"] [URL='https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8207663/']Angus genetic study[/URL] More than you likely want to know but it ties in IBC with pedigree, genomics and something else that escapes my brain without going back up in the study. I will do that later. But it is an interesting study if you work off of facts. What is most interesting to me in the traits that are noted as issues of inbreeding depression/regression - the traits that are of concern are many of the traits included in the $M index. Then the fad is to look at both $M and $C and those two cover all of the researched (this paper) depressed traits! So, maybe there is a reason to chase those indices to the tops of the charts! The recent mutations in Angus, in my opinion, were extremely bad because the initial users and maybe the promoters of the sires did not note or tell of the defects early on. To me, that would have been the right thing to do. We had Angus in the 60's and occasionally a dwarf was born. You reported it and that was that... if you were honest! :sneaky: The unspoken of inbreeding is the issue of prepotency of an individual in a population and how it effects inbreeding depression. And there is the Bulmer effect that has another angle on inbreeding issues if you study that. [/QUOTE]
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