I was just about to say it was either ottersatin or grumpy who says that you are culling rabbits to your feed.
So true. Whenever you purchase rabbits, you are always culling them to your practice. I've raised my own from the starter ones, doing what the breeder did and tweaking to fit my circumstances. I lost a few, but then had great success. When I got additions, some lived, some died, but I never blamed the breeder, those rabbits just could not thrive in my environment. I switched feeds every couple of months, mostly because of availability, and barely lost a rabbit, so mine are used to anything, but the growth rate was slow. I noticed that changed when I was able to get the same feed as the breeder, but that only lasted for a while, and in the meantime, as I selectively bred for those that grew well no matter what, it became a non issue.
But I still will never feed anything Purina...