Don't call me psychotic, but i looked it up on the internet.
I know this is a stupid reason, but there is a game i played before and there is a part that talks about mutilated cow corpses that have been found. and something about it happening a lot in the 1960s and 1970s. So i did some research to see if that's actually true, and i can't remember if it was, but i do remember seeing dead cows with their organs spilled out from open holes in their stomach areas. (The game showed no pictures of course, so i looked it up myself)