I'm no expert, but it is my understanding that extra protein isn't real bad for them, but leads to more ammonia in the poop/bedding (and can be more costly). So I guess all the dickering around relates to the level at which more protein doesn't add any more to the birds - which I think would vary all the time based on season, conditions, molting, etc.
I don't do the animal protein thing (yet) - currently using bagged feed (for simplicity, in part). (Though I am reading all this with interest.) But what I AM doing is mixing half Dumor layer crumble (16%), half Dumor 24% chick starter for the adult groups (laying hens plus single rooster) - as a homemade "breeder" ration - on advice of George Jensen. They are doing well on it, better than on FlockRaiser. I'm sure part of this is that Dumor always really fresh at my TSC. Fresh feed = good feed.
- Ant Farm