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New Zealand pastures often contain a higher concentration of nitrogen (N) than required by ruminants, and this can be exacerbated by application of N fertilisers to boost pasture growth. Excess dietary nitrogen (N) has negative implications for environmental sustainability and animal production, but producers and rural professionals are sometimes unaware of these issues and especially the terminology often used to describe the forms and fate of N. Negative consequences for animal production are mostly defined by the energetic expenditure required for the elimination of N intake in excess to requirements. This is associated with costs for urea synthesis from ammonia absorbed from the rumen and degradation of amino acids that are surplus to animal needs for protein synthesis. Environmental consequences are mainly due to high N concentrations in urine patches. Urine is a major pollutant of waterways and a contributor to greenhouse gas emissions from agriculture.

Dietary nitrogen - definitions, digestion, excretion and consequences of excess for grazing ruminants