Table 8.1 shows the parameters that are used in this example.
Table 8.1: Parameters
|
Parameter Name |
Interpretation |
|---|---|
|
init_num_cows[age] |
Initial number of cows of each age |
|
acres_needed[age] |
Number of acres needed to support a cow of each age |
|
annual_loss[age] |
Annual percentage loss per cow of each age |
|
bullock_yield[age] |
Number of bullocks yielded per year per cow of each age |
|
heifer_yield[age] |
Number of heifers yielded per year per cow of each age |
|
milk_revenue[age] |
Milk revenue per year per cow of each age |
|
grain_req[age] |
Tons of grain required per year per cow of each age |
|
sugar_beet_req[age] |
Tons of sugar beet required per year per cow of each age |
|
cow_labour_req[age] |
Number of labour hours required per year per cow of each age |
|
cow_other_costs[age] |
Other costs per year per cow of each age |
|
acres[group] |
Number of acres per group |
|
grain_yield[group] |
Tons of grain yielded per acre by each group |
|
yearly_loan_payment |
Amount of yearly loan payment per capital outlay |
|
num_years |
Number of years in planning horizon |
|
num_acres |
Number of acres in farm |
|
bullock_revenue |
Revenue for selling a bullock |
|
heifer_revenue |
Revenue for selling a heifer |
|
dairy_cow_selling_age |
Age by which a dairy cow is sold |
|
dairy_cow_selling_revenue |
Revenue for selling a dairy cow |
|
max_num_cows |
Maximum number of cows that can be housed at present |
|
sugar_beet_yield |
Tons of sugar beet yielded per acre |
|
grain_cost |
Cost per ton of grain bought |
|
grain_revenue |
Revenue per ton of grain sold |
|
grain_labour_req |
Number of labour hours required per year per acre of grain |
|
grain_other_costs |
Other costs per year per acre of grain |
|
sugar_beet_cost |
Cost per ton of sugar beet bought |
|
sugar_beet_revenue |
Revenue per ton of sugar beet sold |
|
sugar_beet_labour_req |
Number of labour hours required per year per acre of sugar beet |
|
sugar_beet_other_costs |
Other costs per year per acre of sugar beet |
|
nominal_labour_cost |
Present labour costs for farm per year |
|
nominal_labour_hours |
Maximum number of labour hours available without incurring additional labour costs |
|
excess_labour_cost |
Cost per hour of additional labour |
|
capital_outlay_unit |
Capital outlay per additional cow beyond max_num_cows |
|
num_loan_years |
Number of years for loan |
|
annual_interest_rate |
Annual interest rate for loan |
|
max_decrease_ratio |
Maximum relative decrease in total number of cows at end of planning horizon |
|
max_increase_ratio |
Maximum relative increase in total number of cows at end of planning horizon |