I think it kind of depends on what your goal is. I put my Enchi with both my Spider girl and Butter girl and didn't rotate any other males in because I was determined to produce Enchi's and Enchi mixes (and both females are about to lay). But if I wasn't dead set on Enchi's I'd definitely rotate other males in just to be sure someone gets it done. With recessives I'd probably stick to one male.
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