I tractor my rabbits and I never had a problem. They all took straight to eating grass and forage. I've been doing it for a few years now. I've even thrown new rabbits I bought for breeding in the tractor with no issue, maybe it's dumb luck?
I had great results crossing Californian and rhinelander. The offspring were bigger than both parents. One cross female I kept is 12 pounds. I use her as a breeder now. I chalked it up to hybrid vigor.
