hello, FH!! there are loads of very experienced folk here who will give you good advice, but in the interim...
If the ewes are due to go off to the tup soon. i think the idea is to 'flush' them ie give them a good feeding for a couple of weeks ( as long as they are not already too fat) on your best grass supplemented with a high energy lick (your feedmerchant will advise which one) If would suppose the wethers can eat with the ewes, otherwise it may be awkward to seperate them??? you dont waant the ewes too fat cos it can affect their fertility- you end up with singles, and potentially a more difficult lambing.
Oh btw- the lick will keep for later in the winter (later in the pregnancy)...two ewes wont eat it all in a couple of weeks before they go for their nuptuals.
If you dont want to get a lick, i think you can feed them a hard feed, bulked out with some molassed sugar beet. sheep can eat it unsoaked but i always soak it - habit cos of the horses!
If you are needing to give them hay, sheep like the softer hay. whereas horses prefer the courser hay..you would feel the difference if you get the chance to compare. thats not to say that sheep wont eat the courser stuff, or vise versa. I get two different types in, from experience of my sheep's preference.
I have never given my sheep haylage......mmmmm dont know the answer to that. i would wonder if it may bloat them cos of the fermentation process for haylage...someone will correct me!! Also, normally haylage is more expensive!
Hope this helps a bit...until someone else can answer
Emma T