Effect of Potassium Nitrate Intake on Dairy Calves

Abstract

This study provides information on the effects of level, frequency, and duration of nitrate intake on the nitrate tolerance of young dairy animals. Administration of KNO3 to bull calves indicated that the minimum lethal dose for initial intake was in excess of 30 g. per 100 lb. body weight. Toxic response to the compound was found to vary between animals, but was not materially affected by experimental method of intake (by capsule or dissolved in milk). The level of KNO3 ingestion exerted little, if any, influence on the time required for the in vivo formation of maximal levels of methemoglobin (determined spectrophotometrically). Up to 1.3 g. % nitrate, but no nitrite, was detected by microbiological assay of the urine from two calves receiving 25 g. KNO3 per 100 lb. body weight and showing low levels of methemoglobin. © 1958, American Dairy Science Association. All rights reserved.