Models

 

GrassGro is composed of a number of sub models. The illustration below shows briefly how they interact.

 


 

 More details about the sub models

Water Balance Model

Pasture Model

  • Multi-species model
  • Daily time step
  • Uniform field area
  • Biomass-based

Processes modelled

  • Phenology
  • Resource acquisition
  • Net primary productivity
  • Allocation of assimilate
  • Change in DMD
  • Death & litter fall
  • Seeds & seedlings

 

Ruminant Model

    • Based on Australian feeding standard – Dr Mike Freer

    • Intake

      • Potential intake
      • relative intake
    • Energy and protein use

 

  • Mortality

 

Management & Economics Models

  • Five livestock enterprises

  • Profit drivers

    • Stocking rate and replacement policy
    • Reproductive management
    • Supplementary feeding
    • Soil fertility
    • Shearing
  • Gross margin calculations

    • Long-term average and year-to-year variability

For a description of the animal model in GrassGro see the GrazFeed-models page on this website.