This is my 4th year breeding, I've yet to cull any...I just think this is an interesting topic. I have my own thoughts, but will be the first to admit that I need more experience to fully formulate them. As far as keeping any not fit for future breeding, I don't see it as a realistic option...and I am not one to trust that slapping a "pet only" label on an animal will by any means be of any assurance to that end.