Best way is necropsy. What is the sign?

Apparently, without pathologic changes

What they eat?

chopped King grass, molasses, salt and water

How many ram is dead? What about the others? Did you take any sample or blood test? What about the rumen? Empty or full?

My suspected diagnosis could be pulpy kidney

3 lamba where dead (from a 31 lamb herd). I took blood simples for lab tests. No findings at lab. I final decide to vaccinate against clostridium and pasteurella. The orbes animaos where fine. The rumen was full of food.

Vaccinate against clostridium and the sudden death will stop i am sure, do not use any antibiotics but it is usefull to give broad specrtrum anthelmentics, my best

Thanks for your interest and recommendations. Cheers.

Did you check blood nitrate? Hypomagnesemia may cause sudden death.

No I didn´t check blood nitrate. How is the physiopathology through which hypomagnesemia could cause sudden death in lambs?

magnesium deficiency cause sudden cardiac death. read Hypomagnesemia: characterization of a model of sudden cardiac death.J Am Coll Cardiol. 1996 Jun;27(7):1771-6.

Thanks