CALCULATING ECONOMICAL BALANCED RATIONS. 11 



As seen in Table IV, a ton of com contains 1,538 pounds of carbo- 

 hydrates and 138 pounds of protein, or 0.0897 pounds of protein for 

 each pound of carbohydrates. Hereafter, in the discussion of this 

 table, this 0.0897 pound of protein to each pound of carbohydrates 

 is referred to as "proportional protein." It is the proportion of 

 protein apcompanying carbohydrates in corn. 



A ton of dried , brewers' grains contains 884 pounds of carbohy- 

 drates and 430 pounds of protein. Now, in corn, 884 pounds of 

 carbohydrates would be accompanied by 79 pounds of protein (884 X 

 0.097 = 79). The nutrients in a ton of dried brewer's grains may 

 thus be classified as follows: 



Pounds. 



Carbohydrates, 884 pounds, proportional protein 79 



excess protein 351 



Total protein 430 



The digestible carbohydrate content of a ton of each of the various 

 protein feeds is given in Table IV, first column to the right of the 

 double rule. The digestible protein per ton is given in the next 

 column. This is the sum of the proportional protein, given in next 

 to the last column, and the excess protein, given in the last column. 

 The proportional protein in choice cottonseed meal, for instance, 

 which is 74 pounds, merely represents the protein obtained in corn 

 along with 824 pounds of carbohydrates, which is the amount of the 

 latter contained in a ton of choice cotton seed meal. 



The method here outlined is based on the assumption that the 

 carbohydrates and "proportional protein" in a ton of any expensive 

 protein feed are worth just what they would cost in the cheap and 

 standard carbohydrate feed used as a basis of comparison (corn in 

 Table IV). 



The first 11 columns of figures in Table IV give the value of the 

 carbohydrates and proportional protein in a ton of each of the 

 various nitrogenous feeds when the price of corn is as shown in the 

 column headings. 



When corn is worth more than a dollar a bushel, the value of the 

 carbohydrate and proportional protein given in Table IV may be 

 easily obtained by either combining the figures given in two columns 

 or by adding to the values given in one column a proportional part 

 of the values given in another. For example, when corn is worth 

 $1.50 a bushel, double the amounts given in column headed "$0.75"; 

 when it is worth $1.15 a bushel add to the values given in column 

 headed "$1.00" one-third the amount given in column headed 

 "$0.45." 



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

 excess protein, let us assume that corn is 60 cents a bushel and 

 peanut cake is $30 a ton. In the column headed "$0.60" we find 



