I know that most(?) of the Purina poultry feeds are now all vegetarian. Many people state that animal protein is important for poultry, however. What is Purina's position on this, does this position vary based on the species of bird being fed (for example, I own peafowl and a turkey in addition to my chickens - all are fed together), and what is the reasoning for this position (type of research, etc.). Thank you.