8 lambs they get a flap of a small bale of hay on a morning but only eat about 3 /4 of it and go off grazing again and on a night I give them a 3kg bucket of lamb and ewe pencils they eat most of that before the horse gets ther and has a bit , thanks for replying
3kgs between 8 is a very reasonable quantity for store hand-reared lambs over winter. How do you feed it? Can every sheep eat at the same time or are the stronger ones getting most of it? (If the latter, then I would expect one or two of the sheep to be in significantly better condition than the others. If they are all equally skinny, then it's more likely to be a mineral deficiency or imbalance, or fluke or worms.)
If they are eating lamb and ewe cake then they are getting some minerals, but I would probably still give them a chelated drench. Whatever is the cause of the skinniness, a good mineral drench will "buck them up" and help them recover. (Some suppliers offer a combined wormer with minerals, for this reason.)
(On a side note, sheep feed may not be good for a horse; I wouldn't let my horse be getting any.)
Feeding hay effectively to smallish numbers is a bit of an artform... If you give only 1 flap, do you spread it out into a loooooooong line? Or do they all gather around it in one heap? Because if the latter, what often happens is that only the top couple of sheep really get any, then when they have had enough they walk off to graze, and instead of then getting their share, the sheep lower down the hierarchy follow the flock, so don't really get any hay at all. (Similar applies to cake.) Again, if this is what is happening, I would expect one or two of the sheep to be in significantly better condition than the others. If they are all equally skinny, then it's more likely to be a mineral deficiency or imbalance, or fluke or worms.
My rule of thumb is either a loooong, looong line of hay, really spread out, or one heap of hay per 3 or 4 heads, each heap 3 sheep lengths apart (so that dominant sheep can't "guard" two piles at once.)
Sheep generally won't eat tired old hay, so put it out in a different spot each day and clear up what they left yesterday.