Agreed, it just depends on the cow. Some show heifers are great, some arent great. Some commerical cows are great mothers, some arent. It just depends. Alot of the problem with show heifers is the conditioning. Show heifers that are overly fat can have a hard time getting pregnant, can have problems milking, and delivering calves. If managed well, there is no reason that a show heifer shouldnt be as good as a non-show animal.