Tanks that are used to haul nitrogen-based fertilizer should not be used to transport drinking water for cattle as there is a risk of poisoning. Any nitrogen remaining in the tank can potentially cause nitrate or non-protein nitrogen (urea) toxicosis in ruminants (depending on form of fertilizer). It's very difficult to ensure all the nitrogen has been removed from the tank, even if you wash it thoroughly. Providing contaminated drinking water can be an expensive mistake, so don't risk poisoning your cattle by hauling water in tanks that have been used to haul fertilizer.
Nitrate toxicity
Nitrate toxicity occurs when high nitrate levels overwhelm the animal's digestive system to the extent that the rate of conversion of nitrate to nitrite is faster than the conversion of nitrite to ammonia. When this happens, nitrite accumulates and is absorbed into the bloodstream. There, it reacts with the oxygen-carrying hemoglobin, changing it into a form (methemoglobin) that cannot transport oxygen to the lungs and body tissues and the animal suffocates. Death from nitrate poisoning may occur within a few hours.
It takes about twice as much nitrate to kill a ruminant when nitrate is eaten in forage as when consuming contaminated water.
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