Yes, i would. If the ewe has lost condition, anything that reduces the stress on her and allows her to recover is good. We have had two ewes with E Coli , off their food, scouring, one developed mastistis subsequently. They too had metacam, and alamycin, plus a glucose drench and puled through but we began bottle feeding and offered creep to the lambs as soon as we spotted it. Seems to be working and the ewes are back out gain. Yours sounds like it could be twin lamb disease