I feed it too and mix it but they seem to prefer the gold sometimes then they switch and prefer the green. Anywhere there are pigeon breeders, they will carry it too but any Purine dealer can get it. The Mennonite feed store here carried it even before I knew about it. I had been feeding the Layena and they won't touch the Layena if they have the Nutriblend now. I give mine free choice oyster shell and figure they know when they need it, like my horses and minerals who only eat it when needed. I've also gotten the parakeet grit and gravel that has bits of lime (calcium) and they like that too. The Nutriblend is a whole food so I don't give much as far as treats except when it's really cold, then they get a little fine cracked corn and ground flax (I know you don't have to grind the flax for chickens but I do anyway) with grit. I think they handle the cold better with a little extra fat and the heat from the corn but they need the grit if they're eating anything but processed feed, like corn, seeds etc. or they can't digest it.