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<blockquote data-quote="wbvs58" data-source="post: 1823867" data-attributes="member: 16453"><p>Jeanne I disagree about things being hidden. You forget that the ability to detect genetic defects only came about when these were first investigated. In fact Angus asked Dr Jon Beever in the US to investigate these defects and to come up with a test for each one as they became apparent. The technology was not available much before then. These defects do not show up in large numbers, so it does take a while to realise there is any pattern. Abnormalities have occured in all breeds since eternity, I can show you examples of many abnormal anomalies in my old pathology textbooks and these have always been considered freaks of nature. It is only with modern DNA capability that more has been discovered about them. With the last defect DD a lot of the initial reporting was done by a local Land Services Veterinarian in a town just over the state border to me. Lisa and her husband are also Angus breeders. Lisa had collected samples from various calves she had been called to and it was her samples that were sent to Jon Beever who identified the problem then subsequently developed a test for it, all happened very promptly. The incidence of the defect was very low and even much lower than the recessive homozygus dd would have you expect.</p><p>I can understand why Simmental require DNA testing as you have introduced many other breeds to the breed however Angus have a closed herd book so there are no introductions. The genetic status of all registered Angus are there for all to see. When you say you test them what do you test for? There is no blanket test to test for all.</p><p></p><p>Ken</p></blockquote><p></p>
[QUOTE="wbvs58, post: 1823867, member: 16453"] Jeanne I disagree about things being hidden. You forget that the ability to detect genetic defects only came about when these were first investigated. In fact Angus asked Dr Jon Beever in the US to investigate these defects and to come up with a test for each one as they became apparent. The technology was not available much before then. These defects do not show up in large numbers, so it does take a while to realise there is any pattern. Abnormalities have occured in all breeds since eternity, I can show you examples of many abnormal anomalies in my old pathology textbooks and these have always been considered freaks of nature. It is only with modern DNA capability that more has been discovered about them. With the last defect DD a lot of the initial reporting was done by a local Land Services Veterinarian in a town just over the state border to me. Lisa and her husband are also Angus breeders. Lisa had collected samples from various calves she had been called to and it was her samples that were sent to Jon Beever who identified the problem then subsequently developed a test for it, all happened very promptly. The incidence of the defect was very low and even much lower than the recessive homozygus dd would have you expect. I can understand why Simmental require DNA testing as you have introduced many other breeds to the breed however Angus have a closed herd book so there are no introductions. The genetic status of all registered Angus are there for all to see. When you say you test them what do you test for? There is no blanket test to test for all. Ken [/QUOTE]
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