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So 50% AI take isn't any good? Read this.
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<blockquote data-quote="regolith" data-source="post: 819347" data-attributes="member: 9267"><p>grubbie and 3way: my experience suggests that breeding only on the second heat would be a complete waste of time - if you're going to synch at all, might as well catch what you can on the first round because second (natural or not) isn't likely to be better.</p><p></p><p>However, you might note that I usually synchronise anestrous dairy cows, some of them not more than 6 - 8 weeks between calving and synchronising. One year saw about 50% still holding at 3 weeks to CIDRs, 25% to the second cycle and three weeks later a totally exhausted and lame bull because 16 cows returned for a third cycle all on the same night (he was still valiantly attempting to serve as many as he could come daylight). Yet other years, the returns have spread themselves over the entire three weeks, with maybe a cluster at 18 - 22 days. My other observation (and in the group synchronised that year, this was true for those that had been maybe less than 8 - 9 weeks after calving) was that a lot of cows missed cycles, in a pretty random pattern. Slipping back into anestrus then cycling when they're ready is what you might expect, but some cows cycled twice then skipped a cycle or other variations.</p></blockquote><p></p>
[QUOTE="regolith, post: 819347, member: 9267"] grubbie and 3way: my experience suggests that breeding only on the second heat would be a complete waste of time - if you're going to synch at all, might as well catch what you can on the first round because second (natural or not) isn't likely to be better. However, you might note that I usually synchronise anestrous dairy cows, some of them not more than 6 - 8 weeks between calving and synchronising. One year saw about 50% still holding at 3 weeks to CIDRs, 25% to the second cycle and three weeks later a totally exhausted and lame bull because 16 cows returned for a third cycle all on the same night (he was still valiantly attempting to serve as many as he could come daylight). Yet other years, the returns have spread themselves over the entire three weeks, with maybe a cluster at 18 - 22 days. My other observation (and in the group synchronised that year, this was true for those that had been maybe less than 8 - 9 weeks after calving) was that a lot of cows missed cycles, in a pretty random pattern. Slipping back into anestrus then cycling when they're ready is what you might expect, but some cows cycled twice then skipped a cycle or other variations. [/QUOTE]
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So 50% AI take isn't any good? Read this.
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