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Dead newborn-predation? Birth defects?
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<blockquote data-quote="Lucky_P" data-source="post: 1688238" data-attributes="member: 12607"><p>Cut off and freeze an ear, in the event that you experience more like that. It could come in handy. While deformed calves may result from a number of causes or 'accidents' during fetal development, occasionally, there is a heritable genetic defect which may be the cause. </p><p> </p><p>I got my very own Angus genetic defect... Sodium Channel Neuropathy... a registered bull that we purchased as a yearling was evidently the 'founder' - the gene mutation causing SCN appears to have originated in him; no ancestors with genetic info on file carry the SCN defective gene. </p><p>Used him over the entire (commercial) herd for 2 years (fall and spring-calving herds), then used him as 'cleanup bull' behind AI for 5 years(he was very docile, and his daughters were really nice), and used a halfblood SimAngus son on a group of heifers for one season... so, there were occasional sire/daughter, sire/granddaughter matings that resulted in defective calves - born alive at term, but were unable to stand and had to be euthanized... and the SimAngus son also was a carrier and sired some defective calves out of granddaughters and great-granddaughters of his sire. IIRC correctly, we had 14 defective calves born over a 5-year period. </p><p>I had saved frozen ears from almost all affected calves, blood samples from almost all cows that delivered defective calves and had extensive records of cow families, which were all helpful in helping Dr. Jon Beever (then at UofIL) identify the abnormal gene. We ended up pulling blood samples from every female in the herd to identify which ones were carriers, which were defect-free. Bulls had been sold to slaughter before we got to the point of pulling blood samples. </p><p></p><p>Dispersed the herd in 2019, so my SCN carrier cows/heifers are who-knows-where now, but all were just commercial crossbreds (Angus/Simmental/Shorthorn/Braunvieh of varying percentages in the mix), so the likelihood that anyone will ever see SCN again is virtually nil.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1688238, member: 12607"] Cut off and freeze an ear, in the event that you experience more like that. It could come in handy. While deformed calves may result from a number of causes or 'accidents' during fetal development, occasionally, there is a heritable genetic defect which may be the cause. I got my very own Angus genetic defect... Sodium Channel Neuropathy... a registered bull that we purchased as a yearling was evidently the 'founder' - the gene mutation causing SCN appears to have originated in him; no ancestors with genetic info on file carry the SCN defective gene. Used him over the entire (commercial) herd for 2 years (fall and spring-calving herds), then used him as 'cleanup bull' behind AI for 5 years(he was very docile, and his daughters were really nice), and used a halfblood SimAngus son on a group of heifers for one season... so, there were occasional sire/daughter, sire/granddaughter matings that resulted in defective calves - born alive at term, but were unable to stand and had to be euthanized... and the SimAngus son also was a carrier and sired some defective calves out of granddaughters and great-granddaughters of his sire. IIRC correctly, we had 14 defective calves born over a 5-year period. I had saved frozen ears from almost all affected calves, blood samples from almost all cows that delivered defective calves and had extensive records of cow families, which were all helpful in helping Dr. Jon Beever (then at UofIL) identify the abnormal gene. We ended up pulling blood samples from every female in the herd to identify which ones were carriers, which were defect-free. Bulls had been sold to slaughter before we got to the point of pulling blood samples. Dispersed the herd in 2019, so my SCN carrier cows/heifers are who-knows-where now, but all were just commercial crossbreds (Angus/Simmental/Shorthorn/Braunvieh of varying percentages in the mix), so the likelihood that anyone will ever see SCN again is virtually nil. [/QUOTE]
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