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There are many benefits to feeding your poultry some source of animal proteins. The biggest one is the various amino acids. Poultry are omnivores, that means, they eat pretty much everything, meat, vegetables, all sorts of things. And there are some amino acids that are only available in natural sources from actual animal proteins: lysine and methionine are the two most important to poultry (for humans, I will not that we are unable to synthesize carnatine without sources of animal protein, so vegetarians are encouraged to take a carnatine suppliment.) But I digress.
Most "vegetarian" poultry feeds suppliment with synthetic forms of lysine and methionine. This has been the subject of threads here before, and some people have posted links to studies which "prove" that there is no difference between the natural sources and the synthetic sources. All I can go by is my own personal experience. And in my experience, when I feed my chickens feed with no animal proteins, I see a negative affect, primarily in the feather quality, but also in overall health and in the amount of feather picking.
When I first started out here in KY with poultry, I was buying Southern States feed. It had no animal proteins. My birds picked at each other a lot, some to the point where I had to cull a couple (they had more than adequate space, so that wasn't it.) Based on some research, and after a very long phone call with a feed expert at the Southern States headquarters, I changed their feed and added in animal proteins. Nothing else changed, yet the feather picking went away and hasn't come back. So despite the "expert studies" saying that synthetic sources of amino acids are sufficient for poultry health, I will never feed my birds a vegetarian-only diet. Of course, everyone's situation is different, and should anyone else choose to do so, I would not say they were doing something wrong, I just know what I do is right for me and my birds.
Some feeds that contain animal protein include: Tiz Wiz, Kent (my personal favorite, but no longer carried locally), and Buckley. Dumor used to, but I don't think it does any more, and several years ago they changed the Dumor formulation, putting something into it (molasses?) that made it much darker, smellier, and made my chickens feces smell horrible. So I don't use it except as a last resort.
I am currently using Purina mixed with Buckley, am waiting for the Buckley rep in OH to send me a shipment of their "show bird" feed for me to try. I love my
TSC store, but I won't use Purina exclusively, as it is vegetarian only (and I am pretty sure it has soy in it, don't know how they'd get the protein levels right without it.)
You can add animal protein into your feed in any number of ways. Some people use fish or fish meal, but do so with care, as the taste of the eggs can be impacted if you use too much (been there, done that!)
You can buy cheap ground beef, fry it, and feed it to your birds. You can hard boil any extra eggs you have, mash them up and feed them to the birds with the shells included (they love hard boiled eggs!), or you can do what I and others do, and feed dry cat food in small amounts to your birds. I know there are some people who really hate that last option, and there are some issues with it that I will not argue. But it's cheap, it's easy, and it works really well. My birds thrive with it, and I find it works for us.
Hope that answers your questions.