These cows have been given a fistula, a hole directly into the stomach that scientists can reach into and study to see how certain foods get digested. Through this kind of work, better food can be concocted and studies into stomach cancer and other problems can be conducted. Although it looks inhumane, the cows don't seem to mind.
*HORF* You know, now that I think about it, I think they had a cow like this at Virginia Tech when I was there. Of course, I never saw it because I wasn't allowed anywhere near the animal husbandry department. Funny story -- did you know sheep can file restraining orders?
Hit the jump for some even more disturbing imagery.
HOLY COW! [slightlywarped]
Thanks to MLou, who can unscrew her bellybutton.