Mcdonald Show Animals said:
At what age will a stallion usually become fertile?
Much earlier than one might think. Sort of like when someone lets bull calves run with the heifer mates.....and, bingo, next spring the yearling heifer has a calf! There have been many horse folks who wean colts and fillies together and leave them together all winter and ....same thing. Pregnant yearling fillies that foal when theyre 2. Not a good thing! Obviously, not all colts will be capable of impregnating before their yearling year, but some will. I'd keep 'em apart just as soon as they're weaned and if the colts are left on their dams 'til they're 6 or 7 months old, separate colts and dams from fillies and dams. JHMO, but I raised Morgans for many years and saw just about everything!