Totally newbie question. I've been looking a gobs of pictures of cattle and have noticed that most all *show* bulls are HUGE as are the bulls that different ranches/farms sell for breeding or seman, etc. My question is it mostly genetics, genetics plus feed, mostly feed or what that makes these bulls so large? Growth hormones? It just seems they are much larger looking than the average bull you see in peoples pastures that they use for breeding. Thanks.