Add Yahoo as a preferred source to see more of our stories on Google. Cow on a summer pasture. Herd of cows grazing in Alps. Holstein cows on summer pasture. Mature cow at grass field. Cows eating ...

Cows are literally designed to eat for hours, which can actually get them in trouble. The rumen, or a cow’s first stomach (and why they’re called ruminators), is a fermentation system that thrives on ...