@conference {69477,
	title = {Simulated impacts of increased nitrogen retention in dairy cows on nitrate leaching from grazed pasture},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {70},
	year = {2010},
	month = {Jun},
	pages = {86-87},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Palmerston North},
	abstract = {The intensification of grazing land has increased the amount of nitrogen (N) entering waterways, reducing their quality and clarity. Between 60 and 90\% of the N ingested by grazing cattle is excreted in urine and dung (Haynes \& Williams, 1993), providing the major source of nitrate leached from grazed pasture. Reducing the N content of urine can therefore have a major impact on nitrate leaching, which can be achieved by reducing dietary N or improving N partitioning in the animal. Some  techniques that improve N partitioning have been evaluated. These include dietary manipulation and the use of metabolism modifiers (Di \& Cameron, 2000).},
	issn = {1176-5283},
	author = {de Castro J and Bryant JR and Burggraaf VT}
}
