What it does
The Hill Grazing Management Model was developed at the Macaulay Institute by Dr. Helen Armstrong. The model predicts the foraging behaviour of hill sheep in the British uplands and provides estimates of the proportion of the annual dry matter production of each vegetation community that is likely to be removed by sheep in each month and over the whole year.
What it can be used for
The model can be used to investigate the impact of different seasonal and annual stocking rates of sheep on hill vegetation.
The model is non-spatial so cannot take account of different vegetation patterns.
Two published papers describe the relationships and parameters used in the model:
Armstrong, H.M., Gordon, I.J., Sibbald, A.R., Grant, S.A., Hutchings, N.J. & Milne, J.A. (1997). A model of the grazing of hill vegetation by sheep in the UK. I. The prediction of seasonal biomass of vegetation. J. of Applied Ecology, 34, 166-185.
Armstrong, H.M., Gordon, I.J., Sibbald, A.R., Hutchings, N.J., Illius, A.W. & Milne, J.A. (1997). A model of the grazing of hill vegetation by sheep in the UK. II. The prediction of offtake by sheep. J. of Applied Ecology, 34, 186-206.
Obtaining a copy the model
The model is stand-alone and has built-in user help. The Hill Grazing Managing Model, along with a tutorial, are available free of charge from the contact below.
You will be emailed the model as a zip file containing all the setup files, a tutorial and two published papers describing the model.
Note that the model is compatible with 16 bits Windows and 32 bit Windows XP.