we started cottonseed 3-4 years ago to supplement our protein. One advantage is that on protein it has to be inside a pen so hogs and livestock cannot get to it. Fawns cannot access it. Cottonseed can be placed anywhere and fawns can feed on it. We saw a good jump in our body weights after we started cottonseed. Just make sure it has been tested for toxins. It is also cheaper than protein
Google gossypol in whole cottonseed. WCS is high in fiber and fat. It can be cheaper but it lacks very critical vitamins, minerals and trace minerals. It is also labor intensive... ie shovel it you do not have a front end loader. To get to the best pricing you will have to contract semi loads of it. By the time you figure in the extra labor and adding minerals you really have not save much. Most ranches will feed it for 2 months post rut if they are feeding it.
I was on a lease years ago in Schleicher County. Landowner was a true rancher and recorded weights of everything: Goats, sheep, cattle, deer, turkeys, EVERYTHING. He began a cottonseed feeding program. Deer weights increased dramatically.