There really isn't a physiological reason why a mare shouldn't be a candidate for AI rather than live cover. On-farm AI when properly performed will result in higher pregnancy rates than live cover, and even shipped semen.
There are reasons other though...
If the value of the mare (or resulting foal) is so low that additional AI costs will not be covered by the sale price (so why is the mare being bred in the first place???);
If the technical ability of the person performing the AI is such that they are not capable, the pregnancy rates will be lowered;
If on-farm AI is being considered with a farm-owned stallion, there are some additional costs associated with setting up to collect and inseminate, but they are negligible and should easily offset the value of the stallion by preventing the loss of the stallion as a result of a live cover breeding accident (and if they don't - again, why is the stallion being bred???).
Great information. I can't wait for your course this fall. I'm really excited about it! Marilyn
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