CHAPTER XII. 

 THE W^OLFF-LEHMANN STANDARD. 



Several decades ago the German scientists, whose 

 names are represented in the title, worked out the above 

 named feeding standard. The foundation for this ap- 

 parently is the nutritive ratio of the ration and the appe- 

 tite of the pig. By nutritive ratio is meant the relation 

 in energy value between the protein on the one hand, and 

 the carbohydrate and fat on the other. The way it is ob- 

 tained is as follows : 



NUTRITIVE RATIO. 



Since the fat of ether extract furnishes 2.25 times aS 

 much energy as either the protein or the carbohydrate, 

 this nutrient is always multiplied by 2.25 in order to re- 

 duce it to the equivalent of the other two nutrients. To 

 this is added the carbohydrate of the ration, and the sum 

 is then divided by the protein, the quotient being the nu- 

 tritive ratio. Thus supposing that a certain ration con- 

 tained 2 pounds of protein, 8 pounds of carbohydrate and 

 1 pound of fat or ether extract the problem would be 

 solved as follows: 

 Fat 



1X2.25=2.25 of carbohydrate or protein equivalent of fat. 

 2.254-8 lbs. of carbohydrate=10.25. 

 10.25-^2=5.125. 



The nutritive ratio of the above ration then is 1 :5.12S 

 and is read 1 to 5.125. 



(143) 



