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RESEARCH ARTICLE
Contents Vol 48(7)

Contemporary livestock carrying capacities for pastoral properties in Northern Australia: a methodology for integrating objective data on pasture growth and condition

J. S. Hamilton A D , C. R. Chilcott B and D. B. Savage C
+ Author Affiliations
- Author Affiliations

A Queensland Department of Primary Industries, Roma, Qld 4455, Australia.

B Department of Agriculture and Food Western Australia, South Perth, WA 6151, Australia.

C School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.

D Corresponding author. Email: Jane.Hamilton@dpi.qld.gov.au

Australian Journal of Experimental Agriculture 48(7) 735-740 https://doi.org/10.1071/EA08035
Submitted: 15 January 2008  Accepted: 28 April 2008   Published: 20 June 2008

Abstract

Stocking rate is often the most important and manageable factor influencing the profitability and environmental sustainability of pastoral properties. Methods for determining carrying capacity, and therefore stocking rate, include subjective approaches based on land manager experience, long-term ‘benchmark’ stocking rates and techniques using computer-aided predictions of pasture growth. This paper presents a new approach for objectively calculating short-term livestock carrying capacities of pastoral properties by integrating remotely sensed ground cover assessments as a proxy for land condition. The study region was three commercial pastoral properties in the north Australian pastoral region (above 26°S). Two properties were situated in the Victoria River District of the Northern Territory and a third in the Kimberley region of Western Australia.

Annual pasture growth was estimated using GRASP, a deterministic, point-based, native pasture model developed for semiarid and tropical grasslands, which was calibrated for the different land types in the study region. Carrying capacity estimates were further refined by investigating trends in landscape cover change between years using data from satellite imagery assessment. These tools have been shown to be useful for inferring land condition and pasture growth within these regions of northern Australia but had not been integrated before this study. This study developed an approach for inferring rangeland pasture condition and applying it to refine short-term carrying capacities, thus aiding decision making. The approach developed in this study is considered to be more applicable for commercial land management than currently available methods for determining carrying capacities on pastoral properties in northern Australia.

Additional keywords: livestock carrying capacities, landscape cover change analysis, semiarid rangelands, pastoral properties.


Acknowledgements

The support and contributions of the University of New England, Northern Territory Department of Primary Industries, Fisheries and Mines and Meat and Livestock Australia are acknowledged. In particular, the assistance of Robert Karfs, Steve Petty, Neil MacDonald, and Luke Peel is gratefully acknowledged.


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