It is going to be colder tonight. Low 30's. I am planning to go get some more wood shavings for the chicken coop. My pot bellied pigs shares the coop with the chickens. but they have their own area {away from the nesting boxes and eggs}. The pigs cover themselves in the shavings but the shaving get pretty grinded and dusty from them walking on it. Would hay or straw be better for bedding for the pigs? Should I add a heater?