Using producers’ own production and financial data from the Holbrook region, modelling was initially undertaken to assess pasture and livestock production, and enterprise profitability for two prior periods (1970-1999 and 2000-2009) to ensure the models were performing correctly. Modelling was then performed looking ahead to 2030, using 4 different climate scenarios.
A breeding feeder steers enterprise was examined.
Weather predictions & pasture production
Projected weather for the four 2030 scenarios and the impact on pasture production are shown below
- Compared to 1970-1999, over the period 2000-2009 rainfall was 20% lower, average maximum temperature was 5% higher and pasture production 12% lower
- For 2030:
- The temperature increases are fairly consistent across the four scenarios (+8%) with rainfall forecasts all suggesting a reduction but with a range of 5% to a 19% (average 11% decrease).
- This leads, on average, to a slight decrease (-3%) in annual pasture production, with a range of -18% to +14%.
- The general trend is for less rainfall in April and May which may affect the timing of the ‘autumn break’ for pasture growth.
- It is predicted there will generally be less total pasture but more winter pasture
- Stocking rates will be lower to maintain sustainable pasture
For more information see the following fact sheet.
Livestock & Financial Impacts, and Adaptations
Using the modelled pasture production figures, the impacts on livestock production and farm profitability were then calculated. Such impacts were initially based on a “business as usual” case i.e. no adaptations (changes to farm management practices) were made.
Then, by discussing these predicted results with farmers, a series of possible adaptations were agreed to and modelled. These adaptations were assessed for their ability (either individually or in combination) to help reduce the impact of climate change on livestock production and farm profitability.
To see the ‘business as usual’ impacts, and then what adaptations were proposed by producers and modelled, for the cattle enterprises at Holbrook, please click on: