Here is a nice article on making your own feed from whole grains and other ingredients:
http://backyardpoultrymag.com/issues/1/1-4/Harvey_Ussery.html
If your chickens have a lot of space to free range where plant diversity is good, then insect diversity will also be good, and they will be able...
Yes, Cindy, they definitely like them, but the point is that a diet of oats only is not sufficient. I, too, feed them in a mix of bird seed and scratch grains as a treat, but this is part of a varied, balanced diet.
No, you cannot feed solely oats. Protein content might be high enough, but it cannot possibly be a balanced diet. That's why chicken feeds contain multiple ingredients. Like people, chickens are omnivores and like people, they need a varied diet to meet all their nutritional requirements...