I feed my chickens Purina Layena free range because it uses Soldier Fly partially as its protein source. I chose this food because it made sense to me that this is what mostly matched what a chicken would eat in "nature" not soy. I also was trying to stay away from soy as much as possible to due its connection with estrogen and breast cancer, etc in humans and concerned about it passing on the effects of soy in their egg production. Does anyone know of another brand that uses this as its protein source in a complete pellet form? I'm having a hard time finding Purina lately. Also, why isn't soldier fly more widely used in poultry feed pellets, if anyone knows? It just seems like it would be an obvious choice for a protein source to me.