One has to remember that animals have a thick hide...think how thick your leather boots are. Add a thick coat of hair to help keep them warm. Having them out of the wind is as important as anything when this type of weather hits. Last night we had a fresh cow with a newborn heifer..not born outside, but well bedded maternity pen is not heated. Defense (yes that's her name) decided to calve early by a couple of days. Not sure if she knew the nasty weather is ahead of us. I'm sure the little one has an insulated calf coat to help keep her body warm. This time of year all little baby calves start out with one. We also have a calf warming box to help with the extreme cold.