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Breeding / Calving Issues
Calf born with deformed head
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<blockquote data-quote="Lucky_P" data-source="post: 1307716" data-attributes="member: 12607"><p>Hydrocephalus,for sure. Not all cases are due to a heritable genetic defect like NH...but due to recent concerns about it - it's the first thing most of us think about. I know I did, when I saw the photo!</p><p></p><p>Sounds like you've done the requisite sleuthing on the pedigree... provided that all animals in the pedigree are as represented. (Case in point... there's currently a very popular Angus sire whose dam was registered as a daughter of DHD Traveler 6807... but later was determined to actually be a daughter of Vermilion Dateline 7078). </p><p>Sometimes there are errors in pedigrees... whether by mistake(as in the above) or by intent. </p><p>Sometimes cows 'switch' calves... black Angus cows with black Angus calves...calving together in a pasture... and you didn't see it happen... how do you KNOW for sure which calf REALLY belongs with which cow? Are you sure the mating you recorded for that cow is what's actually in that bull or heifer calf that she's mothering?</p><p></p><p>Back in the day, to prove a bull 'free of known genetic defects', you'd have to breed him to 35 of his own daughters... if all calves were normal, there was a greater than 95% likelihood that he was not a carrier of anything bad. A 'handful' of sire/daughter matings with no problems don't rise to that level.</p><p></p><p>If you're determined to 'rule out' NH as a possibility, you could dig the calf up, cut off an ear and submit that for testing... or test the sire and dam.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1307716, member: 12607"] Hydrocephalus,for sure. Not all cases are due to a heritable genetic defect like NH...but due to recent concerns about it - it's the first thing most of us think about. I know I did, when I saw the photo! Sounds like you've done the requisite sleuthing on the pedigree... provided that all animals in the pedigree are as represented. (Case in point... there's currently a very popular Angus sire whose dam was registered as a daughter of DHD Traveler 6807... but later was determined to actually be a daughter of Vermilion Dateline 7078). Sometimes there are errors in pedigrees... whether by mistake(as in the above) or by intent. Sometimes cows 'switch' calves... black Angus cows with black Angus calves...calving together in a pasture... and you didn't see it happen... how do you KNOW for sure which calf REALLY belongs with which cow? Are you sure the mating you recorded for that cow is what's actually in that bull or heifer calf that she's mothering? Back in the day, to prove a bull 'free of known genetic defects', you'd have to breed him to 35 of his own daughters... if all calves were normal, there was a greater than 95% likelihood that he was not a carrier of anything bad. A 'handful' of sire/daughter matings with no problems don't rise to that level. If you're determined to 'rule out' NH as a possibility, you could dig the calf up, cut off an ear and submit that for testing... or test the sire and dam. [/QUOTE]
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Calf born with deformed head
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