Cud spilling! No cure, I understand... should be culled as butchers lambs really and ewes should never be bred from as mostly hereditary! Can be caused by jaw defects or reflux... similar to reflux in humans. Causes malnutrition and leads to poor condition/body weight hence culling! They do keep eating! I recommend making sure he has a mineral lick in and maybe Ovithrift for keeping his nutrition up! The lamb I am caring for with it does't seem bothered by it at all - she eats well and I give her additives - she is going for meat in November tho instead of becoming a breeding ewe!