Control systems in farm planning

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Abstract
It is argued that farm planning techniques are not being used to best advantage despite recent developments. Planning techniques could be used in a more operational way by continually updating plans and allowing for the accuracy of data estimation to be improved over time. The necessity for feedback control in successfully implementing plans in uncertain operating environments is stressed. As an illustration of how an integrated planning and control system could be applied in agriculture, a control system within a simulation model of intensive beef production is considered in Section 6. Input-output coefficients vary between cattle, which implies that there are different optimal marketing and feeding policies for different cattle. However, because of the masking effect of certain biological and environmental factors, there is the problem of identifying cattle with below- and above-average gain performance. Bayes' theorem is used for reassessing the gain performance of cattle each time they are weighed at periodic intervals.

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