Trying some molasses today. So far not bothered. They do no how to peeve me off. Next batch will be out through the day and in at night's I think.Can you get some molasses? Either in one of those ball feeders or mix it through some hard feed to entice them. Maybe some ehole oats and barley just to get them eating.
I don't know what numbers you're going to be lambing but could you run them in at night and loose them out on the grass in the day time?
Also are they eating something that's locking up trace elements? So they can't utilise what you've given them?
And remember if you don't say f**king sheep at least 3 times a day you're not lambing