im not 100% sure but I think it either means
'if you ban hunting we are going to leave dead horses all over the roads'
'if you ban hunting we are not going to have a use for our hunters, so they have to be slaughtered'
You can do anything with a hunter though, where I live (rural england) most of the horses I see, ride and come into contact with are hunter bred or hunted in the past and ARE doing other things. There are even hunter jumper shows and higher level competitions that involve hunters or exhunters
(sorry rant 0_0)