I board my goats on my brothers farm, went out to do chores this morning and one of their calves was down, head back, eyes rolled back and appeared to be in a seizure. I contacted my nephew/vet was called but did not arrive before calf died. While vet was out, another calf went into a seizure. Vet stated he did not know what caused seizures or death of calf. Nephew did not have any blood work done to determine cause. any suggestions.