Whats a good mix/rate?

It seems like everytime i post something theres some confusion either from me or someone else, so a little insight on what im doing. I have a good friend thats in the pet food business, and hell pay me pretty good money for timothy and alfalfa, but its gotta be pure/clean. That said, ive got around 35 acres that i plan to square bale. What would be a good seed rate for a timothy/alfalfa/orchard grass mix? Or is there a better mix i should think about? Primary buyers will be horse people.

Whats a good mix/rate?