Response to Climate Change: Evaluation of Methane Emissions in Northern Australian Beef Cattle on a High Quality Diet Supplemented with Desmanthus Using Open-Circuit Respiration Chambers and GreenFeed Emission Monitoring Systems

The main objective of this study was to compare the effect supplementing beef cattle with Desmanthus virgatus cv. JCU2, D. bicornutus JCU4, leptophyllus JCU7 and lucerne on in vivo methane (CH4) emissions measured by open-circuit respiration chambers (OC) or GreenFeed emission monitoring (GEM) system. Experiment 1 employed OC utilized sixteen yearling Brangus steers fed a basal diet Rhodes grass (Chloris gayana) hay four treatments—the three cultivars (Medicago sativa) at 30% dry matter intake (DMI). Polyethylene glycol (PEG) added diets neutralize tannin binding explore CH4 emissions. 2 GEM forty-eight animals allocated treatments including plus equal proportions 0%, 15%, 45% DMI. Lucerne equilibrate crude protein content all treatments. showed no difference between cultivars, diet. an increase levels containing Desmanthus. It is concluded that high-quality diets, does not reduce