ANIMAL FOODS AND FEEDING 



301 



Production Values for Cattle. — In fattening cattle the 

 productive energy results in increase in body weight, and this 

 factor as well as the Calorie unit has been used as the measure 

 of such energy. The term used is pounds of flesh gained, which 

 is not exactly equivalent to increase in live weight, as the latter 

 includes water. 



When fed in addition to a basal maintenance ration each of 

 the food nutrients has been found to possess a certain production 

 value. This value is not, however, in proportion to the relative 

 metabolizable energy values of the same nutrients. Expressed 

 in Calories Kellner ^ has found that the following are the 

 results : 



TABLE XV 



Metabolizable Energy and Production Energy of Nutrients 



Summary. — Let us summarize what has been said in regard 

 to digestibility and energy values by means of a table giving the 

 results for three of our common animal foods as fed to fattening 

 cattle. 



1 " Die Ernahrung der landw. Nutztiere," p. 159. 



2 The values for sugar are less than for starch and crude fiber, viz. .188 pounds 

 flesh gained. 



3 The values for fats (ether extract) in concentrates like cottonseed meal and in 

 cereal grains is greater than for hay. Production value for oil foods equals .598 

 pounds flesh gained, for grains .526 pounds flesh gained. The latter value applies 

 to the total ether extract of ordinary mixed foods. 



