junebuggena
Crowing
There are strict regulations for diet when it comes to commercially produced meat animals because what they eat, the customer will eventually eat. Things like antibiotics and some pathogens linger in the tissues and can be passed on through the food chain, one animal to the next. Animal feed is not held to the same regulations, however. It's just safer for the producers to use a feed without animal proteins so they don't have the risk of their meat being rejected for having traces of something or other.Hmmm. Funny... I worked on a farm that produces meat pigs (pork) and have always been told to never feed meat to animals intended for butcher... I can't remember why off the top of my head though.
This isn't really a problem when it comes to home raised chickens. If I've already fed something to my family, there is little reason not to give it to the chooks. And very few illnesses can pass from mammal to poultry. The chickens love it when it's time to slaughter rabbits. They get the fresh blood, hearts, lungs, and livers.