I have to side with those who feed thier chickens meat. I really beleive that sicne they're omnivores, they need those particular amino acids that they don't get from vegetable protein. We had major pecking/feather-eating issues this winter in our small flock, and supplementing with animal protein definitely seemed to help. WE started with Balck Oil Sunflower, etc, but it wasn't making a difference.
Also, I don't know your reasons for vegitarianism, but the environmental, social and political impacts of the USA's monoculture of soybeans and corn are pretty nasty. I prefer not to contribute heavily to that. Of course there are lots of other reasons to avoid soy as well. Unfortunately there are not many feeds out there that don't contain soy. The only one I can find has to be mail-ordered and that makes it too pricey for me.
So, we feed organic feed supplemented with lots of other things like organic greens and veggies.... but what the girls really go bonkers for is animal protein. here are some examples from the past couple of weeks:
1- the skin and bones from canned salmon
2- canned tuna
3- the fat and trimmings from the Organic, pastured beef and pork we buy locally (table scraps)
4- organ meats from same (might be a good way for vegetarians to do it cheaply: buy these inexpensive meats, cook -or not- chop, and freeze in small portions to feed later)
5- cooked eggs
This summer when DD is catching way too many small mackerel we'll freeze those for the chickens as well.
We also supplement with AviaCharge 2000 in the winter, which is a natural fish- and seaweed supplement with many amino acids.
Stacey