Sorry, no advice to give but kind of sad I guess that I'm reading this with interest
.
Had my original Soay ewes for what must be a good 3 years now and have NEVER had to clean their bums or dag them. I am going to boast and say they have spotless posteriors
.... I know, I know, nothing better to do. However, a few of last years wethers have dirty backends. Not as bad as the photo but then they don't have so much wool. Have been wormed and fluked
and have dagged for the first time ever and washed down but now the muck is returning . Was thinking of getting a sample to the vets but maybe it's as FW says and some are just like that.
Obviously they won't be bred from anyway but must make them a good target for flies