A Utah producer lost 22 out of 50 head of cows in May, due to ammonia toxicity. He used a liquid fertilizer tank to haul water to the cattle. He had done this for two years previously, and with washing out thoroughly, there had been no problem. But this time some fertilizer was evidently left in, mixed with the water and resulted in the toxicosis.
Bagley, Clell, "Ammonia Toxicity in a Herd of Beef Cattle" (1997). All Current Publications. Paper 434.