Nothing wrong with the oatmeal except that (1) it is way to expensive for chicken feed and (2) it has lost most of it's nutritional content through the mill and age.
Whole Oats retain there nutritional content longer.... as does any whole grain.
Whole grains are always the way to go over milled or cracked feed when you can get them.
I really should buy oatmeal by the ton. My girls love it! Cooked on a cold day or raw out of carton, doesn't matter. Next to tomatoes and cantaloupe, it's their favorite treat. Whole grain is better than the quick oats.
I agree I was feeding them store bought but after reading your comment I bought 50 pounds it cost around 13 bucks. Feed prices fluctuate daily . Its good stuff on cold morning it was 11 % protein.