I dont think I would add Alfalfa to the mix as goats love it and when its green it can cause them to bloat as they pig out on it. Mine eat grass all the time out browsing. I have Nigis, Alpines, Nubians, and La Manchas...they will knock you over for green grass and also they love leaves and brush too. Check with your extension agent as see what is better to plant for them as the chickens dont care. You just dont want to make your goats sick.