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12.
I don't know.
So close! That was an option.
I don't think there's enough information in that question, you could easily expect numbers in the 80%+ range if there's been an estrous synchronization protocol or numbers in the 0% range if they're still in their postpartum anestrus period. Would also expect differences in numbers if it's a dairy herd vs a beef herd in general
It had the caveat of no human intervention.
The answer was 6 because the estrus cycle is 21 days. So 122/12 = ~6