Lot of good points. I don't think mares should have to wait until 5 or 6 but I don't think it would be a terrible idea to force stallions to. I still think the best idea is to limit books by age. A 3yo can only cover 20 mares, 4yo can only cover 60, 5yos and up can cover 100. That way you aren't forcing injured horses to wait but at the same time there is less incentive to retire a sound 3yo.
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