I do the same thing with some oats, toss it on the straw so they dig (and they do!).
If I smell ammonia, how would I add carbon? In what form? thanks
I Found out that straw is working much better than the wood shavings. I don't have to clean weekly. In fact, I don't think I will have to clean all winter.
The only time I ever have had ammonia issues was when I was using shavings. Using leaves, hay, grass clippings, and mixed garden debris eliminates any ammonia issues IME. I do agree with Aart that it's best to use a mixture of materials, both shape and texture/size. I only use shavings if I run out of leaves.