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Diet effects on urine composition of cattle and N2O emissions

Published online by Cambridge University Press:  06 June 2013

J. Dijkstra*
Animal Nutrition Group, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands
O. Oenema
Alterra, Wageningen UR, PO Box 47, 6700 AA Wageningen, The Netherlands Department of Soil Quality, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands
J. W. van Groenigen
Department of Soil Quality, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands
J. W. Spek
Animal Nutrition Group, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands Wageningen UR Livestock Research, PO Box 65, 8200 AB Lelystad, The Netherlands
A. M. van Vuuren
Wageningen UR Livestock Research, PO Box 65, 8200 AB Lelystad, The Netherlands
A. Bannink
Wageningen UR Livestock Research, PO Box 65, 8200 AB Lelystad, The Netherlands
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Ruminant production contributes to emissions of nitrogen (N) to the environment, principally ammonia (NH3), nitrous oxide (N2O) and di-nitrogen (N2) to air, nitrate (NO3) to groundwater and particulate N to surface waters. Variation in dietary N intake will particularly affect excretion of urinary N, which is much more vulnerable to losses than is faecal N. Our objective is to review dietary effects on the level and form of N excreted in cattle urine, as well as its consequences for emissions of N2O. The quantity of N excreted in urine varies widely. Urinary N excretion, in particular that of urea N, is decreased upon reduction of dietary N intake or an increase in the supply of energy to the rumen microorganisms and to the host animal itself. Most of the N in urine (from 50% to well over 90%) is present in the form of urea. Other nitrogenous components include purine derivatives (PD), hippuric acid, creatine and creatinine. Excretion of PD is related to rumen microbial protein synthesis, and that of hippuric acid to dietary concentration of degradable phenolic acids. The N concentration of cattle urine ranges from 3 to 20 g/l. High-dietary mineral levels increase urine volume and lead to reduced urinary N concentration as well as reduced urea concentration in plasma and milk. In lactating dairy cattle, variation in urine volume affects the relationship between milk urea and urinary N excretion, which hampers the use of milk urea as an accurate indicator of urinary N excretion. Following its deposition in pastures or in animal houses, ubiquitous microorganisms in soil and waters transform urinary N components into ammonium (NH4+), and thereafter into NO3 and ultimately in N2 accompanied with the release of N2O. Urinary hippuric acid, creatine and creatinine decompose more slowly than urea. Hippuric acid may act as a natural inhibitor of N2O emissions, but inhibition conditions have not been defined properly yet. Environmental and soil conditions at the site of urine deposition or manure application strongly influence N2O release. Major dietary strategies to mitigating N2O emission from cattle operations include reducing dietary N content or increasing energy content, and increasing dietary mineral content to increase urine volume. For further reduction of N2O emission, an integrated animal nutrition and excreta management approach is required.

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Copyright © The Animal Consortium 2013 

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