Dear Octavio

You should at least be aware of the following papers:

White, D.H., Bowman, P.J., Morley, F.H.W., McManus, W.R. and Filan, S.J.
(1983).  A simulation model of a breeding ewe flock.  Agricultural Systems
10, 149?189.
.. model based on ryegrass and subterranean clover pastures in south-eastern
Australia - original model no longer supported; it and derivative models
have been used on a wide range of applications over nearly 30 years.

Moore, A.D., Donnelly, J.R. and Freer, M. (1997). GRAZPLAN: Decision
support systems for Australian grazing enterprises. III. Pasture growth and
soil moisture submodels, and the GrassGro DSS. Agricultural Systems 55,
535-582.
... model developed and maintained by Andrew Moore and colleagues at CSIRO
Plant Industry in Canberra - simulates growth of different pasture species
and mixes.

Cheers

David White
___________
Dr David H White
ASIT Consulting
P.O. Box 328
Hawker, ACT
AUSTRALIA 2614
Phone: 61 2 6254 5936
Fax (if on): 61 2 6255 2455
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http://www.acslink.aone.net.au/asit