Changes

Right, i've just bred two female horses.... old-fat-ragegrey(f) mated with aged-fat-tomdance(m) with a pregnancy time of 11WW... aged-fat-eckerlightning(f) mated with aged-fat-waldowalking(m) with a pregnancy time of 5ww... Is there some relation to the age I know that it says "Pregnancy times varies from 5-11 wurm weeks, regardless of the animals to species." But is the pregnancy durationrandom or related to animal age?