The mare would not lose a pregnancy as a simple result of the colt's presence, but if she is not pregnant the yearling colt may breed her, and you may be unaware of the fact that the foal that is produced next year is by the yearling colt, and not the stallion of your choice. Additionally, if she is in foal now, and the colt breeds her, then she may lose the pregnancy.
Many thanks, I wasnt sure if it was a good idea or not so will keep them apart.
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