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Breeding / Calving Issues
How accurate should I expect ultrasound to be?
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<blockquote data-quote="regolith" data-source="post: 1168832" data-attributes="member: 9267"><p>The vets we use for dairy won't confirm anything as bred that is less than six weeks - about 42 days. A couple years ago my vet got to play with some short bred cows of mine and he was seeing them with the scanner at 28 days, I had one about 14 or 17 days pregnant that he couldn't detect (she did calve to that mating).</p><p></p><p>What I've been doing to get accurate dates is getting the vet out twice, once four weeks after the bull comes out (about sixteen weeks after the start of mating) then again four weeks later to confirm the late calvers that caught on the last cycle. If I only did the second visit I'd have my early calvers confirmed in calf, but they won't call a date past twelve weeks so they couldn't distinguish between a cow that is due in the first week of calving and one due five or six weeks later.</p><p>I don't think I've ever found one called wrong, except for the times when short bred cows later turn up open. I have seen them called wrong when working with other herds where the whole herd is scanned. </p><p></p><p>Scanning should be 95%plus accuracy. Opens I don't just trust the scanner, usually I'll observe them in heat & also have them confirmed open by palpation before culling.</p></blockquote><p></p>
[QUOTE="regolith, post: 1168832, member: 9267"] The vets we use for dairy won't confirm anything as bred that is less than six weeks - about 42 days. A couple years ago my vet got to play with some short bred cows of mine and he was seeing them with the scanner at 28 days, I had one about 14 or 17 days pregnant that he couldn't detect (she did calve to that mating). What I've been doing to get accurate dates is getting the vet out twice, once four weeks after the bull comes out (about sixteen weeks after the start of mating) then again four weeks later to confirm the late calvers that caught on the last cycle. If I only did the second visit I'd have my early calvers confirmed in calf, but they won't call a date past twelve weeks so they couldn't distinguish between a cow that is due in the first week of calving and one due five or six weeks later. I don't think I've ever found one called wrong, except for the times when short bred cows later turn up open. I have seen them called wrong when working with other herds where the whole herd is scanned. Scanning should be 95%plus accuracy. Opens I don't just trust the scanner, usually I'll observe them in heat & also have them confirmed open by palpation before culling. [/QUOTE]
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How accurate should I expect ultrasound to be?
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