CALCULATING ECONOMICAL BALANCED RATIONS. 13 



3. In the last column opposite the name of the feed is given the 

 amount of excess protein in a ton. Divide the value obtained above 

 by this amount and the result is the value of a pound of excess pro- 

 tein, when bought in the feed considered. 



RELATIVE VALUE OF CARBOHYDRATE FEEDS WHEN THE CHEAPEST 

 AVAILABLE FEED IS NITROGENOUS. 



In some sections of the country the most available feeding stuff is 

 distinctly nitrogenous in character, and it is desirable to buy carbo- 

 naceous feeding stuffs to balance the ration. Thus, in the South, 

 cottonseed meal is frequently the basic feeding stuff, while in many 

 parts of the West alfalfa occupies this position. In such cases it 

 becomes desirable to know the cheapest available source of carbo- 

 hydrates. The method of procedure is given in the following pages. 

 It is similar to that already given for evaluating protein feeds. 



As seen in Table V a ton of choice cottonseed meal contains 740 

 pounds of digestible protein and 824 pounds of digestible carbohy- 

 drate, or 1.113 pounds of carbohydrate for each pound of protein. 

 Hereafter, in the discussion of this table, this 1.113 pounds of carbo- 

 hydrate to each pound of protein is referred to as ' 'proportional car- 

 bohydrate." It is the proportion of carbohydrates accompanying 

 protein in cottonseed meal. 



A ton of barley contains 180 pounds of protein and 1,408 pounds 

 of carbohydrate. Now, in cottonseed meal, 180 pounds of protein 

 would be accompanied by 200 pounds of carbohydrate (180 X 1.113 = 

 200). The nutrients in a ton of barley may thus be classified as 

 follows : 



, Pounds. 



Proteins 180 pounds, proportional carbohydrates 200 



excess carbohydrates 1, 208 



Total carbohydrates 1, 408 



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

 carbohydrate feeds is given in Table V, first column to the right of 

 the double rule. The digestible carbohydrate per ton is given in the 

 next column. This is the sum of the proportional carbohydrate, 

 given in next to. the last column, and the excess carbohydrate, given 

 in the last column. The proportional carbohydrate in dry beet pulp, 

 for instance, which is 102 pounds, merely represents the carbohydrate 

 obtained in cottonseed meal along with 92 pounds of protein, which 

 is the amount of the latter contained in a ton of dry beet pulp. 



The method here outlined is the same as that for Table IV. It is 

 based on the assumption that the protein and the proportional car- 

 bohydrate 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 (cottonseed meal in Table V). 



