I feed hay, in hay racks, (covered / wheeled) from mid december (earlier if the grass has run out or the weather is poor) until the grass has grown and they are spending more time grazing than at the hay rack.
Square bales are my preferred option as they are so much easier to transport and, in my circumstances, I think less wasteful.
Once they have lambed, they need as much foos as they can get, in the 6 weeked before, it needs to be slightly more controlled (lots written on this)
I'm lambing 25 and at 850ft, feeding 3 bales per day, the skinnies are getting food twice a day and the fatties once - probably works out at a large handful of nuts each per feed time, which isn't a great deal, but hopefully will make the difference
I'll be scanning in early feb and hope thatm by then, there won't be skinnies and fatties, they will be the same and I can split for empties and those inlamb