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Breeding / Calving Issues
How accurate should I expect ultrasound to be?
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<blockquote data-quote="Ozhorse" data-source="post: 1164948" data-attributes="member: 18575"><p>I have been getting the same person to ultrasound my cows for the past 3 years. They do a few other big farms around here as well. I have found a consistent pattern that the cows calve usually at least 3 weeks, and often a month to 6 weeks, earlier than estimated. Either that or I am calculating wrong. They will say 8, 10, 12, weeks or whatever, and I work back to the service date and calculate from there based on a 283 day gestation. I suppose that gives me +/- 2 weeks, which is a month, for accuracy of date as they only guess in even fortnight multiples. Perhaps I am calculating wrong. I think they did about 160 head for me last March.</p><p></p><p></p><p>Also this year they missed a first calving heifer that was twinning. If I had known in advance I would have avoided a wreck (ended up with one live cow with one live calf at foot in the end, after a lot of work). But then I did not ask for twins to be looked for.</p><p></p><p>One of my big old registered cows was called in as open. I know they fished around in her for a fair time. She is a really big cow and has had a calf every year. Perhaps she hid it somewhere in there, low down. I remember them saying she looked like she was ovulating at the time of ultrasound. She was AI on 31st Oct 2013 and ultrasound on 6th March 2014. I had her in the yard to ship her to the the meatworks with other old cows, but got soft and threw her out is a really tough back paddock. </p><p></p><p>I was having a look around the other day, and she looked like she was going to calve. And she did, to the AI on the 5th August, a nice bull. She is in a lot worse condition for being out in that paddock as I would not have put a calving cow there.</p><p></p><p>Usually I get rid of empty cows so I dont know if empties really were not in previous years.</p><p></p><p>Is this an acceptable level of accuracy? Do you think I should give feedback? (politely with figures and let them show me if I have calculated wrong) I am not particularly unhappy or anything, just wondering from those who have had more experience than me what level of accuracy I can reasonably expect.</p></blockquote><p></p>
[QUOTE="Ozhorse, post: 1164948, member: 18575"] I have been getting the same person to ultrasound my cows for the past 3 years. They do a few other big farms around here as well. I have found a consistent pattern that the cows calve usually at least 3 weeks, and often a month to 6 weeks, earlier than estimated. Either that or I am calculating wrong. They will say 8, 10, 12, weeks or whatever, and I work back to the service date and calculate from there based on a 283 day gestation. I suppose that gives me +/- 2 weeks, which is a month, for accuracy of date as they only guess in even fortnight multiples. Perhaps I am calculating wrong. I think they did about 160 head for me last March. Also this year they missed a first calving heifer that was twinning. If I had known in advance I would have avoided a wreck (ended up with one live cow with one live calf at foot in the end, after a lot of work). But then I did not ask for twins to be looked for. One of my big old registered cows was called in as open. I know they fished around in her for a fair time. She is a really big cow and has had a calf every year. Perhaps she hid it somewhere in there, low down. I remember them saying she looked like she was ovulating at the time of ultrasound. She was AI on 31st Oct 2013 and ultrasound on 6th March 2014. I had her in the yard to ship her to the the meatworks with other old cows, but got soft and threw her out is a really tough back paddock. I was having a look around the other day, and she looked like she was going to calve. And she did, to the AI on the 5th August, a nice bull. She is in a lot worse condition for being out in that paddock as I would not have put a calving cow there. Usually I get rid of empty cows so I dont know if empties really were not in previous years. Is this an acceptable level of accuracy? Do you think I should give feedback? (politely with figures and let them show me if I have calculated wrong) I am not particularly unhappy or anything, just wondering from those who have had more experience than me what level of accuracy I can reasonably expect. [/QUOTE]
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