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<blockquote data-quote="Running R" data-source="post: 1610205" data-attributes="member: 39288"><p>Finally!!</p><p>I have spent considerable time reviewing coat color genetics, including the classic publications (Ibsen, Olson, et al). I have never seen anyone call white shorthorn bulls homozygous for roaning. I completely concur.</p><p>White colors seem to arise from genes in different ways depending on the breed. It is my opinion that dilution and roaning are dominant modifiers while spotting, belting, white facing and parti-coloring are specific alleles that are phenotypically dominant.</p><p>Got it with the white bull on my blue roan cow. That makes a lot of sense.</p><p>Do you consider all white shorthorn bulls to be homozygous white? Can they be heterozygous white with red in recession?</p><p>What breeds are you trying to get rid of dilution and spotting?</p><p>BTW, back when I was in college (in the 60s), most simmentals were red with and occasional brindle.</p><p>Thanks for the wisdom.</p><p>Pete</p></blockquote><p></p>
[QUOTE="Running R, post: 1610205, member: 39288"] Finally!! I have spent considerable time reviewing coat color genetics, including the classic publications (Ibsen, Olson, et al). I have never seen anyone call white shorthorn bulls homozygous for roaning. I completely concur. White colors seem to arise from genes in different ways depending on the breed. It is my opinion that dilution and roaning are dominant modifiers while spotting, belting, white facing and parti-coloring are specific alleles that are phenotypically dominant. Got it with the white bull on my blue roan cow. That makes a lot of sense. Do you consider all white shorthorn bulls to be homozygous white? Can they be heterozygous white with red in recession? What breeds are you trying to get rid of dilution and spotting? BTW, back when I was in college (in the 60s), most simmentals were red with and occasional brindle. Thanks for the wisdom. Pete [/QUOTE]
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