well theres many schools of thought on this subject , one is some racers that have won wont breed a sausage and some breeders of winners wont race , so by racing the birds out could leave you with racers with a few winner but no breeders of winners , but then theres the best catogory racers that have won that also breed winners , so i would personaly breed a full round and eliminate from the ybs performances as yearlings , so basicaly if not made it as ybs swap pairs round if no winners by 3rd year remove