Teagasc say that a ewe's feed requirement in mid-pregnancy is approximately half of that of a ewe in early lactation producing milk for two lambs.
Which means the importance of building grass now for next spring is critical rather than continuing to graze the entire farm over the winter months and being left with little to no grass when ewes and their lambs are about to be turned out from the lambing shed next spring. It's important to graze out paddocks to a post-grazing height of 3.5-4.0cm. If this isn't done, the result will be higher residuals being carried over, which will lead to a lot of dead material building up at the base of the sward. This build of dead material will, therefore, impact on grass growth and quality next spring - which we want to avoid. And most importantly, it's vital not to re-graze closed paddocks.