His research has focussed on protein, energy and phosphorus nutrition of grazing cattle and on production systems, particularly the utilization of low quality forages and opportunities for nutritional manipulation and management for improved production outcomes. In recent years, his research has been focussed on the development of spectroscopy of faeces as a tool to measure and understand the nutrition of grazing animals and on phosphorus nutrition of cattle, particularly for reproducing breeders. This research has involved close collaboration with many colleagues including in the University of Queensland, the Queensland Department of Agriculture and Fisheries and CSIRO.