Had four ewes that developed an extremely hard udder after lambing but to my surprise no milk. I gave a shot of oxytocin to facilitate let down of milk but to no avail. My vet suggested it could mean the ewes have opp. I went on the internet and did find info that suggested it is opp as well. I would really like to hear about other peoples experiance with this problem. I took the lambs to be raised on the bottle and the ewes will be culled.