I think that usually, it's the other way around that a ram should not be fed ewe nuts, but anything suitable for ram feeding should be also ok for the ewes. The course mixes are usually suitable for ewes and ram feeding.
I feed a sheep course mix to both ewes and rams and haven't had any side effects in all the years they have been eating it.
How's your new tup doing Bionic - has he served many of your ewes yet?