I put them in as small a field as has good grazing, so the ram doesn't have to spend all his time on the move around the ewes. I also spray the ewes' tag number on one side and go round with my notebook when I check them, to note down numbers - useful come lambing time as I know which ewes to look out for on any given day. Don't forget to check the ram over just before he goes in - teeth, toes, testicles and tone.