I am at 1000' in Southern Scotland and keep Soays, Hebrideans and Shetlands.
For the males (hoggs and breeding tups) and ewe hoggs, we feed adlib hay all winter, a daily handful each of Tup coarse mix when there's snow on the ground or it's hard frozen (which is mostly) , and they have a WCF sugarcorn licky bucket - oh and fresh water always of course. When we are pruning they also have willow branches to chew on and sometimes apple branches, ash etc - these provide minerals and vitamins.
For breeding ewes, we give the same as the males except they have a more regular dose of coarse mix. We haven't started feeding that yet to any, although we have put out some hay today for the first time - there is still grass but its nutrient content is lowered by the cold weather and we are approaching tupping time. In some years when the snow has come early we have given them coarse mix at tupping time, but usually we don't start that until the tups are removed, so sometime in December. We then continue a little hard feed right through until after they have lambed, but increasing on the 'rising plane of nutrition' in the six weeks leading up to the start of lambing, and tailing off afterwards. Because we run our breeds together, and we don't scan, we have to give a fairly innacurate rate of feed, but averaging about 3/4 lb each by the end of March (we lamb in April). In addition to the Sugar corn, the breeding ewes have a Crystalix bucket.
In fact I take an empirical approach to feeding, in that I judge how the animals are looking and increase or decrease their feed accordingly. I also take into account how keen they are to eat it - if it all goes instantly then I know they need a bit more. The Primitives are not greedy sheep (except some Shetlands) so tend not to overstuff themselves, so if there is feed left over for the hens to scaff then I've fed the sheep too much.
I've just modified the amount prelambing to 3/4 lb - I'm not really sure just how much we do give.