ANIMAL FEEDING. 



47 



duced to carbohydrate equivalent) for any food or com- 

 bination of foods is called the nutritive ratio. It may be 

 expressed as wide, medium or narrow, depending upon 

 its value. Timothy hay, 1 to 16, is wide. 



94. What is the nutritive ratio of corn, containing 7.8 

 per cent of digestible protein, 66.7 per cent digestible car- 

 bohydrates, and 4.3 per cent of digestible fat? 



Fat will produce 2.4 times as much heat as the same amount 

 of carbohydrates. The carbohydrate equivalent, therefore, of 4.3% 

 of fat is 2.4 X 4.3% or 10.3%, . e., the heat and fat-producing 

 power of a feed containing 4.3% digestible fat is the same as one 

 containing 10.3% of digestible carbohydrates. The total heat and 

 fat-producing power of corn is, therefore, 66.7% -j- 10.3% = 77.0%. 

 The nutritive ratio, therefore, is 77.0 -=- 7.8 = 9.3 This fact is 

 expressed by saying the nutritive ratio of corn is 1 to 9.8. 



Process: (1) Reduce the fat to its carbohydrate equivalent, 

 (2) add the carbohydrates and (3) divjde this sum by the protein. 



TABLE SHOWING DIGESTIBLE NUTRIENTS. 



95. Check the nutritive ratios as shown in the last 

 column of the above table. 



96. Fill out the remainder of the last column. 



97. Name the feeds having a wide nutritive ratio, nar- 

 row, medium, 



