We also have some lovely bright wheat straw and the sheep are quite happy to eat it. You get a fair amount of wastage as they leave the very stalky bits, but I spread that as bedding. So don't assume that because they still have some left that they will eat it - you need to sort out the stalks as it gets eaten down.
However, as said it is low in protein, energy and minerals, so I give them a high protein and energy feed block so they can help themselves to make up what they might be lacking in.