Part V of the livestock productivity model (Figure 2.1) deals with quantification of livestock productivity potential (secondary productivity) of land (agro-ecological cells). This is achieved by setting feed requirements of livestock systems from Part IV against feed supply from Part I.
However, before it is possible to set feed requirements against feed supply, the latter from its various sources as applicable must be quantified by agro-ecological cell in relation to the objective function driving the model.
The permissible thermal and LGP zones for the different livestock systems is taken from the Tables 6.1 and 6.2, and the expected output of the products per herd TLU is taken from Table 6.3 for cattle, goat, sheep and camel, and from Section 7.5 for poultry and pig. Where output performance is assumed to be affected by constraints such as temperature stress, tse-tse, the expected loss in performance output is taken into account.
