USDA is demanding studies before admitting the obvious: Hempseed is the original animal feed. Ironic.
In 1915 Hempseed was one of the grains used to develop modern animal feeds, and the idea of combining proteins to increase quality. Here are more Hemp citations found in academic literature that I commissioned in 1999 for my book The HempNut Health and Cookbook. The source was an agriculture database which is not online, with perhaps a million references. All were originally sourced by hand from libraries around the world for at least the past 45 years by William Shurtleff of the Soyfoods Center.