Our ewes lamb in Spring. Last year we lambed one group inside, turning out after a few days when they are strong enough to avoid the foxes. This was really successful. Another group we lambed entirely outside, with the alpacas for protection.
They are finished entirely on grass etc The first lambs are ready at about 5 months old. We sell the majority into an organic livestock co-operative, however we do still do sell some direct, when we have enough orders for whole or half lambs. We have very successfully spit roasted lambs for social occasions which have been very well received - maybe you should try it?!