i have over 50 rabbits and I leave mine together for a week at a time to make sure they breed. A female is more prime in her younger age the older they get the less they want to breed but I do have one that is 3yr old and she is breeding strong. I breed all kinds from Dutches, to Lions heads, Lops, Gients, red eyes, and blues eyes Albinos, French Lops, I have 7 mothers on babys as i wright this