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<blockquote data-quote="farmerjan" data-source="post: 1389625" data-attributes="member: 25884"><p>I am not a big fan of timed AI either. Quite a few of the dairies I test do it, and the average conception is about 30%. As a relief tech for select sires many years ago, my average was 50% just straight AI on natural heats, and that was figuring in the farmer getting her caught in heat, and calling, and getting there at the right time, and dealing with hot summer days, and a dozen other things. I AI some of my own cows and try to get in the 65-75% on first breeding, all natural heats, and usually do better in the 80-90% range. But I also breed early in the heat and then if they are still messing around 8-10 hours later, will rebreed. I had a guernsey that was so hard to get bred and after some blood tests and other stuff, that the vet wanted to do to "learn" some more, found that she was releasing the eggs WAY late and the semen was pretty much useless except to breed her as late as possible; like 6-12 hours after I saw the heat. It worked. </p><p>On your cows, I would have bred them twice 6-12 hours apart, on the second breeding just for some extra insurance...</p><p>Another thing, if you are breeding to try to have spring calves, then you are breeding in the hottest part of the summer. Were these 2 cows bred on terribly hot days? Did you breed them in the early eve after the hottest part of the day so their body temp was hot enough to "cook" the semen? If you want to do timed AI then you need to breed them very early in the morning when it is the coolest and DON'T let them out into a hot pasture. You are fighting nature if they are too hot. That is why I like that most all our bulls are evening and night breeders since the cows body temps are cooling off and there is a better chance of them settling. I might see a bull breed one cow during the day in the summer, but the ones being bred now we see alot more. The bull knows it's too hot to go bother a cow when it is 95* out....</p></blockquote><p></p>
[QUOTE="farmerjan, post: 1389625, member: 25884"] I am not a big fan of timed AI either. Quite a few of the dairies I test do it, and the average conception is about 30%. As a relief tech for select sires many years ago, my average was 50% just straight AI on natural heats, and that was figuring in the farmer getting her caught in heat, and calling, and getting there at the right time, and dealing with hot summer days, and a dozen other things. I AI some of my own cows and try to get in the 65-75% on first breeding, all natural heats, and usually do better in the 80-90% range. But I also breed early in the heat and then if they are still messing around 8-10 hours later, will rebreed. I had a guernsey that was so hard to get bred and after some blood tests and other stuff, that the vet wanted to do to "learn" some more, found that she was releasing the eggs WAY late and the semen was pretty much useless except to breed her as late as possible; like 6-12 hours after I saw the heat. It worked. On your cows, I would have bred them twice 6-12 hours apart, on the second breeding just for some extra insurance... Another thing, if you are breeding to try to have spring calves, then you are breeding in the hottest part of the summer. Were these 2 cows bred on terribly hot days? Did you breed them in the early eve after the hottest part of the day so their body temp was hot enough to "cook" the semen? If you want to do timed AI then you need to breed them very early in the morning when it is the coolest and DON'T let them out into a hot pasture. You are fighting nature if they are too hot. That is why I like that most all our bulls are evening and night breeders since the cows body temps are cooling off and there is a better chance of them settling. I might see a bull breed one cow during the day in the summer, but the ones being bred now we see alot more. The bull knows it's too hot to go bother a cow when it is 95* out.... [/QUOTE]
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