I have made a lot of cattle feed and fed a lot of cattle. The shit taste terrible. The main protein supplment used for cattle is cottonseed meal. It is 41% protein, and looks and tastes like dirt. You can buy a 50lb. bag for $10, though. So, for those who are having trouble sparing change for whey, try cottonseed meal.
in all seriousness i heard of something imilar my friend friend takes "horse hormones" as he puts it it isnt fina or eq it has glass in it to increase absorbtion , but he couldnt elaborate more because he didnt know and he hasnt seen the gy in a year