>>25511216
see
>>25508779
if there aren't slats then the traditional method is to put straw on the ground, which then needs to be shoveled out and replaced with clean straw. straw costs money.
they are only indoors for a couple of weeks for lambing, or for separation or quarantining.
some people do lambing outside, but this has way too many problems for anyone with sense to deal with, e.g. rain and snow.