Valentine with a distended rumen

My herd is full of lopsided cows. Cattle are ruminants which means they have an extra stomach that sort of digests their food, then they regurgitate it as a cud and chew the food more.  The rumen is where they store the hay while they go through the first digestion.  A cow who has eaten a lot of hay will have one side very extended.  That's the side with the rumen.  Right now, with this very cold weather, all my cows are lopsided with lots of hay in their rumens making heat to keep them warm,