The differentials used in calculating the differences between the 425
pound Medium 1 (Choice) weaned steers, and other weights and classes, are also
given in the first Table (A). For example, the 485 pound Medium 2 'Good)
grade backgrounded steers are estimated to be $5.50 lower than the Medium
(Choice) steers in 1981. Thus, the price used for the 485 pound Good steers
is $58.50 while it is $64.00 for the 425 pound Choice steers. The
differentials are used to derive the prices for all other weights and classes
of cattle. The coefficients used to derive the differentials are given in the
program.
Income, Herd Size and Land Utilization
The projected income for each year, including the base year, is given
next, in Table I. The example shows that the 174 Choice weaned steers
weighing an average of 425 pounds each sold in the base year (1981), for the
total revenue of $47,328.00. There are 144 Utility grade cows, plus 96 Cutter
grade cows, or a total of 240 cull cows sold. The culling rate is 14 percent
of the initial brood cow inventory. Total revenue from all cattle sales is
$357,331.
There are 1,762 brood cows shown in the 1981 herd count, which is based
on the end-of-year 'inventory. Each end-of-year inventory becrwi- it,,
beginning of-the-year inventory for the next year. The beqinninq inventory
for the first year is read in as input data. Using 1981 as the example, the
1,762 brood cows are calculated by adding the number of brood cows at the
beginning of the year (1,710 head, the number entered in the computer) plus
308 yearling heifers at the beginning of the year minus the number of "cows to
replace," (another item given in the end-of-the-year herd count). The "cows
to replace" (256) is the number culled (14 percent of initial inventory, or