really? poultry manure, poultry by-product meal, poultry offal meal anybody?There's no "ugly stuff" in meatbird feed, it's simply a higher protein feed to support the fadt griwth rate of meaties. You can also feed all flock feed, or any high protein, low calcium feed.
https://www.sciencedirect.com/science/article/pii/S0032579119524774
https://www.sciencedirect.com/science/article/pii/S0032579119321479
https://www.sciencedirect.com/science/article/pii/S0032579119402101