Years ago when I was learning about how to raise cattle from my father there was something that always stuck in my head. He once told me that if a cow from the south was brought up north where it is very cold, that it would starve to death. But you can bring a cow from up north to the south. I asked, why is that Daddy? His answer was that cows in the south have 2-3 stomachs and the cows up north have 5-6 stomachs. Thus I presume it allows the cows up north to take in more feed to regulate their body temps so that they won't starve and then freeze to death.