It also depends on where you are and what you want from your sheep.
Here, our primitives get grass all summer, hay all winter, plus some Carrs Champion Tup and Lamb coarse mix (designed for male sheep, but great for breeding primitive ewes as it doesn't have such high protein as commercial ewe feeds) in the six weeks before lambing or when there's snow lying (we get a lot of that). The tups only get the T&L if there's snow lying.
We also feed willow branches and leaves, especially in winter as a vitamin and mineral supplement. A red licky bucket (Crystalix) and a Himalayan salt lick help ensure no deficits.