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Cattle Boards
Breeding / Calving Issues
Ultrasound Due Dates
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<blockquote data-quote="Jessica06" data-source="post: 1299568" data-attributes="member: 5612"><p>Up to about 60 days, it's pretty easy to tell a 5 day difference. From there to about 120 a 10 day difference is still very noticeable. From 120-150 you can still get pretty close by the size of the cotyledons and amount of fluid. If you wait longer than that you might have problems since the calf is starting to drop and you might not see anything that's easy to measure. You can still get a pretty good idea on months bred all the way up to the end by judging cotyledon size, or finding an eyeball to measure. In general, the earlier you can check with ultrasound the more accurate it will be. We try to hold off until 45 days on our commercial cows to allow for any early abortions, but we check our AI's at about 35 days. The earliest pregnancy I've seen is 27 days.</p><p></p><p>Since we've started aging our pregnancies and calling due dates, I don't think we've had any more than 2 weeks off. The vast majority were within a week. Might be a few more surprises this year since we weren't able to get to them until about 150 days. More early calves would be great!</p></blockquote><p></p>
[QUOTE="Jessica06, post: 1299568, member: 5612"] Up to about 60 days, it's pretty easy to tell a 5 day difference. From there to about 120 a 10 day difference is still very noticeable. From 120-150 you can still get pretty close by the size of the cotyledons and amount of fluid. If you wait longer than that you might have problems since the calf is starting to drop and you might not see anything that's easy to measure. You can still get a pretty good idea on months bred all the way up to the end by judging cotyledon size, or finding an eyeball to measure. In general, the earlier you can check with ultrasound the more accurate it will be. We try to hold off until 45 days on our commercial cows to allow for any early abortions, but we check our AI's at about 35 days. The earliest pregnancy I've seen is 27 days. Since we've started aging our pregnancies and calling due dates, I don't think we've had any more than 2 weeks off. The vast majority were within a week. Might be a few more surprises this year since we weren't able to get to them until about 150 days. More early calves would be great! [/QUOTE]
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