“Nitrate poisoning in cattle is caused by the consumption of an excessive amount of nitrate or nitrite from grazing crops, hay, silage, weeds, drinking water, lubricating oil, fertilizer, etc.” (Gadberry & Jennings).
To learn how to prevent and treat nitrate toxicity, click here.
Source: Shane Gadberry and John Jennings. “Nitrate Poisoning in Cattle.” University of Arkansas Division of Agriculture. Retrieved from www.uaex.edu on 7/19/12.