CALCULATING ECONOMICAL BALANCED KATIONS. 17 



The proportional carbohydrate in barley, for instance, which is 

 696 pounds, merely represents the carbohydrates obtained in alfalfa 

 hay along with 180 pounds of protein, which is the amount of the 

 latter contained in a ton of barley. 



As previously stated, the method here outlined is based on the 

 assumption that the protein and "proportional carbohydrates " in a 

 ton of any expensive carbohydrate feed are worth just what they 

 would cost in the cheap protein feed used as a basis of comparison 

 (alfalfa hay in Table VI). 



The first 10 columns of figures in Table VI give the value of the 

 protein and the proportional carbohydrates in a ton of the various 

 carbohydrate feeds when the price of alfalfa hay is as shown in the 

 column headings. Other figures to correspond to a different value of 

 alfalfa hay may be easily obtained either by combining the figures of 

 two columns in Table VI or by increasing those of one column by a 

 proportional part of those in another column. For instance, when 

 alfalfa is worth $7, increase the figures found in column headed 

 "$6.00" by one-fourth of those found in column headed "$4.00" to 

 get figures corresponding to alfalfa at $7. 



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

 protein let us assume that alfalfa hay is $10 per ton and barley is 

 available at $22.88 a ton or 55 cents a bushel. In the column headed 

 "$10.00" we find that when alfalfa is $10 per ton the protein and the 

 proportional carbohydrate in a ton of barley is worth $8.49. The 

 excess carbohydrate in a ton of barley thus costs $22.88 — $8.49 = 

 $14.39. Since there are 712 pounds of excess carbohydrate, a single 

 pound costs $14.39-^-712 = $0.0202, or 2.02 cents. 



The use of Table VI is further illustrated in the following problem: 



Alfalfa hay is available at $12, shelled corn at $25, barley at $23, 

 and milo grain at $24 a ton. Which of the three grains is cheapest as 

 a source of carbohydrates for balancing an alfalfa ration ? 



Solution: 



Corn. Barley. Milo. 



$25.00 $23.00 $24.00 



J 7.81 1 10.19 2 9.85 



1004) 17.19 2 712) 12.81 2 751) 14.15 



3 0.0171 3 0.0180 3 0.01884 



In this case, corn is the cheapest source of carbohydrates. 



HOW TO USE TABLE VI. 

 Follow the directions given for the use of Table V. 



1 Table VI, column headed "$12.00," opposite corn, barley and milo. These figures represent the 

 Value of the protein and proportional carbohydrate in a ton of the feeds in question. 



2 Table VI, last column. ,. 



3 Value of a pound of excess carbohydrates. 



