You need to talk to the place where you are getting the meat. On beef, the animal carries the bulk of the weigh in the rear quarters. The highest priced retail cuts come from the rear end. The front quarters are mostly bone and connective tissue.
The Bison carries most of its weight on the front end. If you watch a bison, they will pivot on the front end, as opposed to a beef critter pivoting on the rear end. I am not sure whether this is due to the front quarters being larger or the taller chine bones and resulting shoulder hump of the bison. Again, ask your meat person about bison versus beef.
Here, found this for you.
http://www.bisonworld.ca/quarter.html