52 



BASIS OF CALCULATION OF COW-UNITS IN TABLE 19 



Certain assumptions were made to calculate the number of cow -units and 

 the feed cost per cow -unit. The assumptions were as follows: 



1. A 165 -day feeding period 



2. Feed required: 



(a) Cows - 20. pounds of hay per day 



(b) Weaner calves: 



(1) 11.0 pounds of base hay during entire period 



(2) 1.0 pound of supplemental hay if fed 



(3) 0. 5 pound of 41 percent cottonseed cake if 

 fed, valued at $80. 00 per ton 



3. Costs for each type of hay and production per acre are as in- 

 dicated in tables 11 and 12. 



The example below explains in greater detail how the number of cow -units 

 was determined. 



Problem: How many cow-units will a 200 -acre hay meadow provide 

 winter feed for, if: 



1. The breeding herd receives regular harvested hay? 



2. Weaner heifers received hay produced from meadows 

 that are harvested twice on land receiving phosphate 

 fertilizer and the sod has been seeded with legumes? 



Basis : How many acres are required to provide feed for 100 cow -units 

 under this management systena: 



1. 100 cows X 165 days x 20 pounds per day = 



330,000 pounds, or 165.00 tons, of hay 



165 tons regular hay needed 



= 79 327 acre 



2. 08 tons regular hay per acre 



2. 20 weaners x 165 days x 11 pounds per day = 



36, 300 pounds, or 18. 15 tons 

 18. 15 tons of P+S hay needed 



K ,11 I ■ . _ o fi Q 7 



2. 71 production P+S day per acre 



