CALCULATING ECONOMICAL BALANCED KATIONS. 15 



The first seven columns of figures in Table V give the value of 

 the protein and proportional carbohydrate in a ton of the various 

 carbohydrate feeds when the price of cottonseed meal is as shown in 

 the column headings. When the value of cottonseed meal varies 

 from that given in the column headings the value of protein and 

 proportional carbohydrate can be made to correspond by increasing 

 the figures in one of the columns a proportional amount. For in- 

 stance, when cottonseed meal is worth $12 per ton the figures in 

 column headed $10 should be increased by £, or 20 per cent. 



To illustrate the method of arriving at the cost of a pound of 

 excess carbohydrate let us assume that choice cottonseed meal is 

 $35 and dried beet pulp $15 per ton. In the column headed "$35.00" 

 we find that when cottonseed meal is $35, the protein and propor- 

 tional carbohydrate in a ton of dried beet pulp are worth $4.35. 

 The excess carbohydrate in a ton of beet pulp thus costs $15 — $4.35 = 

 $10.65. Since there are 1,238 pounds of this excess carbohydrate, a 

 single pound costs $10.65-^1,238^0.86 cents. A few additional 

 problems will show the ease with which computations may be made 

 by use of this table. 



Problem 1. — Choice cottonseed meal is available at $35 per ton. ■ 

 Sorghum grain can be bought at $20, rough price at $28, and shelled 

 corn at $30.35, or 85 cents per bushel. Which is the cheapest source 

 of carbohydrate ? 



Solution : 



Sorghum Shelled Rough 



grain. corn. rice. 



$20. 00 $30. 35 $28. 00 



^.lO x 6.53 M.45 



1273)12.90 2 1384) 23.82 2 1263) 23. 55 



0. 0101 0. 0172 0. 0186 



Problem 2. — Given cottonseed meal at $30 per ton and shelled 



corn at 95 cents per bushel, what is the value per ton of barley, oats, 



and rye for balancing a cottonseed meal ration ? 

 Solution : 



$33. 92 (Value of ton of corn at 95 cents per bushel. See Table m.) 

 5.59 (See Table V, column headed $30, opposite corn, shelled.) 



1384) 28.33 (For 1384, see last column Table V, opposite corn, shelled.) 



0. 0204 (Value of a pound of excess carbohydrates in corn.) 



Barley: A ton of barley contains 1,208 pounds of excess carbo- 

 hydrates, which, at 2.04 cents per pound, is worth $24. 64. 3 The 

 protein and the remaining carbohydrates are worth $7.30. (See 

 Table V, column headed " $30.00," opposite barley.) Hence, 



1 See column headed " $35.00" (Table V). These figures represent the value of the protein and propor- 

 tional carbohydrate in a ton of these feeds when cottonseed meal is worth $35 per ton. 



2 See last column, Table V. 



3 It is assumed that a pound of excess digestible carbohydrate has the same value regardless of the feed 

 which supplies it. When cottonseed meal is worth $30 and corn 95 cents, a pound of excess carbohydrate 

 has a value of 2.04 cents. This figure is used for determining the value of the excess carbohydrate in oats 

 and rye. The value of the remaining carbohydrate content and the protein in these feeds is taken from 

 Table V. 



