
Probably as much from the raw milk and kefir, as anything. It would be interesting to hear if anybody has done this with soy and raw milk and kefir, or soy-free W/O raw milk and kefir. I know the faster growing meaties don't digest the food all that well, that's why they have the gross, watery poops. If yours are having more normal poops, they're probably absorbing the food better, and I think you could see an improved FCR.
Good job, I'll be watching to see how they turn out.