Present in blood, urine, and milk, the chemical compound urea is the primary form of nitrogen excretion in mammals. Testing for urea levels in dairy cows helps scientists and farmers understand how effectively nitrogen from feed is used in cows' bodies, with important economic implications for farmers in terms of feed costs, physiological effects for cows such as reproductive performance, and environmental impacts from excretion of nitrogen in dairy cow waste. Thus, accuracy in testing dairy cow urea levels is essential.
Since the 1990s, mid-infrared testing of milk urea nitrogen (MUN) has been the most efficient and least invasive way to measure nitrogen use by dairy cows in large numbers. In a recent article in the Journal of Dairy Science, researchers from Cornell University report the development of a robust new set of MUN calibration reference samples to improve accuracy of MUN measurement.
"When a set of these samples has been run on a milk analyzer, the data can be used to detect specific deficiencies in the quality of the MUN prediction that might be corrected by the instrument user or the milk analyzer manufacturer," explained senior author David M. Barbano, PhD, Northeast Dairy Foods Research Center, Department of Food Science, Cornell University, Ithaca, NY, USA. Accurate and timely MUN concentration information "is of great importance for dairy herd feeding and reproduction management," Barbano added.
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