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<blockquote data-quote="KNERSIE" data-source="post: 646242" data-attributes="member: 4353"><p>Provided that the heifers are big and old enough and in good condition your success rate should be higher with heifers than mature cows, but to AI heifers require more skill and patience than mature cows.</p><p></p><p>My % settled on first service varies from 70-90% for both heifers and cows, that is with either 1 or 2 shots Estrumate and then AI on observed heats. </p><p></p><p>This year I used CIDRs for the first time and although I don't know the exact success rates at the moment as I was still out of action when I would normally palpate 6-8 weeks after AI to determine which cows settled to AI it looks to also be about 70-75% just by observed heats the next round with the cleanup bull.</p><p></p><p>About 6 years ago I synchronised 10 heifers with the Crestar method and only 2 settled on the timed AI, never used that again.</p></blockquote><p></p>
[QUOTE="KNERSIE, post: 646242, member: 4353"] Provided that the heifers are big and old enough and in good condition your success rate should be higher with heifers than mature cows, but to AI heifers require more skill and patience than mature cows. My % settled on first service varies from 70-90% for both heifers and cows, that is with either 1 or 2 shots Estrumate and then AI on observed heats. This year I used CIDRs for the first time and although I don't know the exact success rates at the moment as I was still out of action when I would normally palpate 6-8 weeks after AI to determine which cows settled to AI it looks to also be about 70-75% just by observed heats the next round with the cleanup bull. About 6 years ago I synchronised 10 heifers with the Crestar method and only 2 settled on the timed AI, never used that again. [/QUOTE]
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