There are many organic chicken feeds available on the market but most have soy and corn in them which are now thought to be tainted with genetically modified soy and corn. The only way to keep GM food out of your animal feed for sure is to make it or buy it without the soy and corn. I have found an organic feed for my chickens and ducks that does not have the usual soy and corn in it.
The organic chicken feed that does not contain soy or corn is called Cascade Grower/Layer Poultry Feed. It is from Magill Ranch in Wamic, Oregon. Ask your local feed store to carry it for you if you want it. It is more expensive than the usual organic food. http://www.magillranch.com/default.html
Azure Standard also carries Magill Ranch's Cascade Feed if you want to order on line for delivery. However, using Azure is more complicated than getting it from a local feed store. Here is the page with their feed on it https://www.azurestandard.com/shop/search?q=organic+feed&submit=
Azure also has some organic non-soy/corn grains that you could use for your animals.
The Non-GMO Project http://www.nongmoproject.org/ certifies foods that are GMO free but they don't have animal feeds listed on their site.
I am currently searching for a goat feed that is non GM certified and organic. If you know of one, please tell me. Otherwise, I will let you know when I find one.