Depends where you are, IMO. My ewes get no hard feed to speak of in winter - they have access to bucket licks at tupping and mineral blocks the rest of the time. If there is no grass or it is covered with snow then I will bung some hay about, but then they are stocked at low density (1.5/ac). Older ewes will get hi-mag beetlics pre-lambing to keep away twin lamb disease. They may get spoiled this winter because I seem to have been given lots of hay in various guises (some seems so poor, it'd be better off stuck in a pile and burnt, bur I'll see if they eat it, some is good stuff), and after the summer they have had they don't look as great as they did this time last year, although condition score seems to be about 2.5 still - I just am not sure if they will maintain it.