Human greed turns cows into carnivores

IF I had stated that cows are omnivorous in my high school biology exam, I would have failed grossly.

Yet we can’t say American cows are herbivores when we feed them rendered cattle remains, poultry litter (including excrement, spilled feed, dirt, feathers, etc), and when calves are fed cattle blood protein as a replacement for whole milk.

Clearly, cows eat and ‘need’ animal protein, which is more nutritious than that produced from fermented grass.