Got soil sampled for basic soil tests free from rivers agency 4 or 5 years ago. It just said was low on lime and had awful high p and k I think it was at that stage. Didn’t get mineral tests done on grass or soil Thatl affect sheep thoJust a shot in the dark, @will6910 , but have you had a soil analysis as well as forage analysis? If there's any combination in surplus and deficiency that causes lock ups in mins and vits, they can be addressed both on the sward and in the sheep.