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Small Town Kid, Hereford bull
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<blockquote data-quote="SPH" data-source="post: 1682221" data-attributes="member: 20580"><p>We used STK a couple years before they MD defect became know and was being tested for. We got some really good calves out of him, he added a lot of muscle and little extra depth in the hind quarters I thought. Really disappointed when we found out he was a MD carrier and we had used all our semen we had on him so that was it. Still have 1 heifer sired by him that calved this spring that we'll get DNA tested so we know if she has it or not. You have to have both sire and dam as a carrier of this defect in order for the defect to present itself which we never had because we don't have any other bloodlines in our herd that would be MD carriers. We already do a lot of DNA testing in our small herd so we're very diligent about keeping on top of this stuff. We got a big scare a few years ago when the MSUD defect came out as we had used the sire who is the main origin of it 936 and kept a son of his who also came up as a carrier. We DNA tested all our females out of 936 and that son and fortunately just 1 came back as a carrier so we dodged a bullet there as a lot of guys who used 936 were seeing about 50% or more come back as carriers.</p><p></p><p>Just like any carriers you have to be diligent about testing and make management decisions for them. Obviously the easiest way not to add to the number of carriers is to either stop using the bull entirely or DNA test any progeny that is kept and not sent to the feedlot as terminal. We don't buy bulls or semen on any bulls with known defects or ones that haven't been tested for them but unfortunately we've have used bulls that at the time were clean of current known defects then turned out to be carrier of a new defect and had to do additional DNA testing after the fact. Never had any calves with the actual defect as like I said you have to have both parents carriers in order for the defect to present itself. Angus has even more known defects than Herefords do so seedstock operations just have to be more diligent about DNA testing these days and making proper management decisions.</p></blockquote><p></p>
[QUOTE="SPH, post: 1682221, member: 20580"] We used STK a couple years before they MD defect became know and was being tested for. We got some really good calves out of him, he added a lot of muscle and little extra depth in the hind quarters I thought. Really disappointed when we found out he was a MD carrier and we had used all our semen we had on him so that was it. Still have 1 heifer sired by him that calved this spring that we'll get DNA tested so we know if she has it or not. You have to have both sire and dam as a carrier of this defect in order for the defect to present itself which we never had because we don't have any other bloodlines in our herd that would be MD carriers. We already do a lot of DNA testing in our small herd so we're very diligent about keeping on top of this stuff. We got a big scare a few years ago when the MSUD defect came out as we had used the sire who is the main origin of it 936 and kept a son of his who also came up as a carrier. We DNA tested all our females out of 936 and that son and fortunately just 1 came back as a carrier so we dodged a bullet there as a lot of guys who used 936 were seeing about 50% or more come back as carriers. Just like any carriers you have to be diligent about testing and make management decisions for them. Obviously the easiest way not to add to the number of carriers is to either stop using the bull entirely or DNA test any progeny that is kept and not sent to the feedlot as terminal. We don't buy bulls or semen on any bulls with known defects or ones that haven't been tested for them but unfortunately we've have used bulls that at the time were clean of current known defects then turned out to be carrier of a new defect and had to do additional DNA testing after the fact. Never had any calves with the actual defect as like I said you have to have both parents carriers in order for the defect to present itself. Angus has even more known defects than Herefords do so seedstock operations just have to be more diligent about DNA testing these days and making proper management decisions. [/QUOTE]
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