Emails sent to the Montana's Governor's office to not open a slaughter house in Montana or people would not travel there were replied to by staff recommending that you contact the sponsor of the bill: Rep Ed Butcher. Here is what he said:
------ Forwarded Message
From: "Senator Butcher (3rivers)" senatorbutcher@firstname.lastname@example.org
Date: Sat, 21 Feb 2009
Dear ____: I am delighted that you will not be coming to Montana--we really do not need people who lack common sense. You obviously know nothing about horses or Montana and need to stay right where you are! Ed
Horse slaughter is driven by a demand for horsemeat, served as a delicacy in some foreign countries. It has nothing to do with unwanted horses. In fact, the availability of slaughter actually encourages overbreeding of horses. If you want to know the environmental impact of a slaughter house read what Former Mayor Paula Bacon of Kaufman, TX where the foreign owned Dallas Crown slaughter plant was located. http://www.animallawcoalition.com/horse-slaughter/article/686
Butcher says "Boom, the horse is dead". There was nothing humane about horse slaughter in the U.S. If you doubt that, read this and this. And read excerpts of hearings held by Congress last year that included discussion of the horrific cruelty of horse slaughter in the U.S.