Accumulative sodium poisoning in Brazilian swine fed whey.

Fifty 3-4-mo-old piglets died of accumulative sodium poisoning, but none of the 60 adult pigs with the same feeding and management did. The average ambient temperature throughout the period was 32 C. The herd had been regulary fed whey, ground corn and vegetables, but for at least 2 d the pigs were deprived of water and then water was offered ad libitum. Twenty hours later 20 piglets had died and the remaining exhibited classical nervous signs and died within 14 h. Only the piglets had a high degree of dehydration caused by water deprivation and exacerbated by the high average ambient temperature. Pulmonary edema was evident in most piglets. Acute cerebral edema and meningoencephalitis were present in all animals, but there was no polioencephalomalacia. The sodium accumulation was caused by the continuing intake of whey which contained 10,810 mg sodium/L. To produce the whey, 2 kg of sodium chloride had been added to every 100 kg of milk.