FEED NUTRIENTS IN THE ANIMAL BODY 91 



66.8 + 2i(4.3) _^^ 

 7.8 "^-^ 



Therefore the nutritive ratio of corn is 1 : 9.8. 



The nutritive ratio of a ration containing two or more 

 feeds is obtained by calculating from Table 29 or 30 of the 

 Appendix, the amount of digestible protein, digestible car- 

 bohydrates, and digestible fat in the ration and substituting 

 these values^ in the above formula. Thus one calculates the 

 nutritive ratio of a ration of 16 pounds of corn, 3 pounds of 

 linseed oil meal, and 8 pounds of clover hay as follows : 



14.67 + 2^(1.04) 

 2.73 



= 6.2 



Therefore the nutritive ratio of the ration is 1 : 6.2. 



Ordinarily, a nutritive ratio of 1:6 or less is called a 

 narrow ratio, i.e. the feedingstuff or ration contains a 

 relatively large amount of protein and a relatively small 

 amount of carbohydrates and fat. A ratio of 1:7 to 1:9 

 is called a medium ratio, i.e. there is present a medium 

 amount of protein and a medium amount of carbohydrates 

 and fat. A ratio of 1 : 10 or greater is called a wide ratio, 

 i.e. the proportion of protein to carbohydrates and fats is 

 relatively small. The nutritive ratios vary considerably 

 for different feeds, e.g. from 1 : 0.1 in the case of dried 

 blood to 1 : 57.9 in the case of rye straw. 



