I've used a few these of products, and like some said I saw no results. I had a company telling me their product did so and so to the animals, antler growth, cell growth, animal health, etc. I went to the extent of testing said product over a 3 month period by drawing blood(3 times) on 50 animals, 25 eating the product, 25 on regular diet. After said test there was no difference in body weight, health, and # of cells. These products may work for some and others not so much, just my opinion. As for the protein, I would not push past 21-22% personally. At that point your money is going through them and ending up on the ground, not being utilized. You can pump them full but doesn't mean it will do much. Just my 2cents