Some of my shetlands have had a break in the fleece, I am still working through the fleeces to see how many are affected. It doesn't seem to be all, and not confined to the ewes only either. But we have had a particularly hard winter, and mine do not have much shelter and the haylage was not top quality either. They were tupped in the really bad spell in late November... (but all delivered their - mainly twin - lambs, by themselves and I didn't loose any lambs/ewes this year (so far), so maybe that's what is important)
But they were very easy to shear in late May, wool was definitely rising.