We have very high percentage of ewe lambs this year too. Last year we were over run with ram lambs but this year it is the complete opposite. We are using the same rams this year as we did last.
I crossed one zwartble ewe last year with a wensleydale ram, she had fantastic lambs but both were rams. This year I have crossed quite a few of the zwartble ewes with a wensleydale ram and am delighted that I have lots of ewe lambs and only 1 ram lamb. It will be interesting to see how their fleeces turn out, they seem to be more wensleydale like than zwarble like.