I am so sorry to hear that, but all the best of luck hand rearing. I remember 1 year, 2012, we reared about 50 lambs, from a farmer who couldn't rear them, less than half survived, a lot were killed in a bad storm. I still got a few good ewes from them though and one is an awesome animal. I am now currently only rearing 3, 2 females and 1 male. If you put them on lamlac can I recommend a brand? I usually rear the pet lambs on a little watered down buffalo milk, however I have found an alternative powdered milk which is much better than lamlac.
'DENKAVIT' In my opinion it is the best powdered milk on the market, a little expensive, but well worth it.
Hope this helps