Using a modelling approach to evaluate two options for improving animal nitrogen use efficiency and reducing nitrous oxide emissions on dairy farms in southern Australia
KM Christie, RP Rawnsley, MT Harrison, RJ Eckard
Animal Production Science | CSIRO PUBLISHING | Published : 2014
Ruminant livestock are generally considered inefficient converters of dietary nitrogen (N) into animal product. Animal nitrogen use efficiency (NUE) is a measure of the relative transformation of feed N into product and in dairy systems this is often expressed as milk N per unit of N intake (g milk N/100 g N intake). This study was a theoretical exercise to explore the relative potential efficacy and value proposition of breeding versus feeding to improve NUE, reduce urinary N excretion and associated environmental impact in pasture-based dairy systems. The biophysical whole farm systems model DairyMod was used across three dairying regions of south-eastern Australia representing a high-rain..View full abstract
This project was supported by the Tasmanian Institute of Agriculture, the University of Melbourne and the Victorian Department of Environment and Primary Industries, through funding from the Australian Government Department of Agriculture, Dairy Australia, Meat and Livestock Australia and Australian Wool Innovation.