108 



Feeds and Feeding. 



Thirty-six per ct. of 3.8 lbs. is 1.4 lbs., which sum is placed in Table 

 III as the digestible crude protein in 100 lbs. of corn stover. 



In Tables I and II the fiber and nitrogen-free extract are given 

 in separate columns, since, tho of the same chemical composition, 

 they often differ materially in digestibility. The digestible por- 

 tion of each is determined separately and then combined under the 

 term ' ' carbohydrates ' ' in the following table : 



Example Table III, showing the digestible nutrients in 100 lbs. of the 

 feeding stuffs in Table I. 



*Nitrogen-free extract and fiber combined. 



According to Table I, there are 19,7 lbs. of fiber in 100 lbs. 

 of corn stover, 64 per ct. of which is digestible, according to Table II. 

 Likewise there are 31.5 lbs. of nitrogen-free extract, 59 per ct. of 

 which is digestible. Multiplying in each case and adding the two 

 products, we have 31.2 lbs., which is placed in the column marked 

 "digestible carbohydrates" in Table III. The digestible fat is ob- 

 tained in the same manner as the digestible crude protein. For ex- 

 ample, 1.1 lbs. of fat in corn stover multiplied by 67, the factor of 

 digestibility, gives 0.7 lb., which is entered in Table III as the diges- 

 tibile fat in 100 lbs. of corn stover. 



131. Nutritive ratio. — By nutritive ratio is meant the ratio which 

 exists in any given feeding stuff between the digestible crude pro- 

 tein and the combined digestible carbohydrates and fat. It is de- 

 termined in the following manner : The digestible fat in 100 lbs. 

 of the given feed is multiplied by 2.25, because fat has that heat 

 value compared with the carbohydrates, and the product is then 

 added to the digestible carbohydrates. The sum of the two divided 

 by the amount of digestible crude protein gives the second factor 



