The stallion in my avatar was a breeding stallion. The owners did a lot of live cover and during the breeding season he would run his fenceline. He ran it a LOT. As a result, it was very hard to keep weight on him to my satisfaction. But believe me he was well fed.
This breeder does live cover. So, it is entirely likely that he exhibits the same situation. By coming onto the forum and basically accuse these people (of whom you really no nothing) of neglect is poor form.
AND, it has totally hijacked the OP's question.