considered available for gain. Net energy required for mainte-
nance is shown along with the net energy available for gain.
Also shown are net energy for maintenance concentration and the
net energy for gain concentration. The pounds of feed required
for maintenance are calculated and are labeled "FEED FOR
MAINT." This quantity is determined by dividing the net energy
required for maintenance by the net energy concentration For
maintenance (MCAL/LB for MAINT); for example, 3.92/.61 = 6.40
pounds of feed for maintenance in Septeimber. The feed avail-
able for gain is the difference between the toial intake and
the feed required for maintenance and is labeled "FEED FOR
GAIN." When this quantity is multiplied by the net energy
concentration For gain (MCAL/LB for GAIN) the result is the net
energy available for gain; for example, 4.79 x .27 = 1.31 for
September. This value is used to determine average daily gain.


Cost Analysis

 The growth simulation can be executed alone or in conjunc-
tion with the cost analysis model. Output from the growth
simulation model in the form of predicted ending weight, re-
quired stocking rate, and total intake of supplements are input
to the cost analysis. Variable costs per acre for forages and
per pound price of supplements are also passed to the cost
analysis model.

 The USER may also find it helpful to use a worksheet as a
means of assembling data for the cost analysis program. A
worksheet for the illustrative example is shown as Figure 5.
The items in italics are user-supplied. In this example, the
400-pound calf cost $0.55 per pound; medication and minerals
cost $2.00; one growth stimulant at $1.00 is used; other oper-
ating expense is $2.50; interest rate is 13% per annum, and
pasturing death loss is set at 1%.

 Death loss associated with procurement, order buyer
charge, purchase shrink, and transportation in cost are zero.
Auction charge is $5.00 per head, sale shrink is 3%, transpor-
tation out is $4.00 per head, and other marketing costs are
$1.50 per head.

 Estimated labor requirements per calf are 0.67 hours and
the wage rate is $3.50 per hour. Other overhead costs are
$5.00 per head.

 The output of the cost analysis consists of four tables.
For the Illustrative example, the "budget" is given in Table 6
and breakeven prices are given in Table 7. The "cost of gain"
analysis is provided in Tables 8 and 9.