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Cattle Boards
Artificial Insemination (AI) for Cattle
Which protocol to use?
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<blockquote data-quote="angus9259" data-source="post: 1833096" data-attributes="member: 7398"><p>This is interesting. Thanks for posting. I've used a bunch of different methods and they all net about 60% as has been mentioned here. This year I did CIDRS so GNRH and CIDR day 1, pull CIDR and Lute day 7 and then timed AI and GNRH at 60-66 hours. 65%. Interesting to hear some disagreement about GNRH. This year I had my vet sleeve while I prepped semen. We gave em all a GNRH at breeding because that's what the protocol called for. My vet says the purpose of the timed approach and GNRH is to force ovulation. My vet says you never know when a cow will ovulate based on standing heat - they can all be different. So the purpose of the GNRH is so you KNOW when they ovulate because it happens with the shot. A handful of them I wanted to give another straw to later in the day because they were just starting to stand when we bred them and if I were breeding on standing heats, I would have strawed them later that day. She said it wouldn't matter because we gave them the shot so regardless of what we were seeing, they should ovulate based on when they got the shot, not when they were standing (in this case). Some we caught, some we. didn't. Who knows? </p><p></p><p>That said, I'm sticking with this program in the future I think. I felt like the CIDRS intensified the heat signals and I breed in November so there's almost no daylight and having my vet work with me we knocked out 10 animals in no time.</p></blockquote><p></p>
[QUOTE="angus9259, post: 1833096, member: 7398"] This is interesting. Thanks for posting. I've used a bunch of different methods and they all net about 60% as has been mentioned here. This year I did CIDRS so GNRH and CIDR day 1, pull CIDR and Lute day 7 and then timed AI and GNRH at 60-66 hours. 65%. Interesting to hear some disagreement about GNRH. This year I had my vet sleeve while I prepped semen. We gave em all a GNRH at breeding because that's what the protocol called for. My vet says the purpose of the timed approach and GNRH is to force ovulation. My vet says you never know when a cow will ovulate based on standing heat - they can all be different. So the purpose of the GNRH is so you KNOW when they ovulate because it happens with the shot. A handful of them I wanted to give another straw to later in the day because they were just starting to stand when we bred them and if I were breeding on standing heats, I would have strawed them later that day. She said it wouldn't matter because we gave them the shot so regardless of what we were seeing, they should ovulate based on when they got the shot, not when they were standing (in this case). Some we caught, some we. didn't. Who knows? That said, I'm sticking with this program in the future I think. I felt like the CIDRS intensified the heat signals and I breed in November so there's almost no daylight and having my vet work with me we knocked out 10 animals in no time. [/QUOTE]
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Which protocol to use?
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