[Determination of nitrates in feed and blood samples]

Nitrate and nitrite compounds in feedstuffs were readily and immediately absorbed from the digestive tract right after intake. Nitrate, therefore, is reflected in the blood, depending on intake quantity. Nitrate concentrations recorded from the blood are superior to values established from feedstuffs in substantiating conclusions as to intake quantity. A diagnosis of nitrate intoxication, based on feedstuff testing, should be confirmed by blood testing. Two methods are proposed for quantity determination of nitrate levels in feedstuffs and blood. The presence of hypomagnesaemia should be ruled out in any differential diagnosis undertaken for suspicion of nitrate intoxication.