Here is my list of reasons to winter my sheep out-doors on pasture.
*Cheaper-no bedding needed.
*Useful-barn used at lambing time can be used for storing hay,wood,feed,ect. in the winter.
*Healthier-fresh air at all times and makes a hardier animal
*Economical feeding-hay can be fed on the ground (no hay feeders) and if fed in a different place each time does not need to be cleaned up and also fertilizes the pasture.
*Better wool-wool is not as likely to felt Ex. when wet sheep go into a crowded barn they rub on each other causing felting.
*Less labor-no water necessary if there is snow.