Using producers’ own production and financial data from the Lockhart 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 Prime Lamb enterprise was examined. The pasture base was annual ryegrass and sub clover
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 25% lower, average maximum temperature was 4% higher and pasture production 31% lower.
- These figures are among the biggest impacts in the state for this period
- For 2030:
- The temperature increases are consistent (+7%) but the rainfall forecast is more variable ranging from a +8% to -16%, and averaging a 3% reduction.
- Rainfall is significantly less affected than during the dry 2000-2009 period
- On average, there is a 9% decrease in annual pasture production (range +10% to -27%), exhibiting a considerable range similar to rainfall. The USA1 and German models show a considerable reduction while the UK model shows a significant increase
- Generally all models predict lower spring, summer and autumn pasture growth. All models (except German) have higher winter growth with the UK model also having higher spring growth.
- All models (except German) have higher pasture growth in the June to October period followed by lower mid to late spring growth.
For more information see the attached 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 prime lamb enterprise at Lockhart, please click on: