76 



HOW THE ANIMAL USES ITS FEED 



important to keep the dry matter requirements up to the 

 standard, since it is the digestible parts of the ration, 

 rather than the total of its constituents, that is of greatest 

 importance. 



Suppose a ration is required for a cow weighing 900 

 pounds, and producing 16.6 pounds of milk daily. The 

 standard for the 1000 pound cow producing 16.6 pounds 

 of milk daily, calls for 27 pounds of dry matter, 2.0 pounds 

 of digestible protein, ii.o pounds of digestible carbohy- 

 drates, and 0.4 pound of digestible fats. The 900 pound 

 cow will require nine tenths as much or 24.3 pounds of dry 

 matter, 1.8 pounds of digestible protein, 9.9 pounds of di- 

 gestible carbohydrates, and 0.36 pound of digestible fats. 



Assuming that there are available for feeding, corn silage, 

 red clover hay, wheat bran, and ground oats, the follow- 

 ing amounts may be selected for a trial ration : 20 pounds 

 of silage, 10 pounds of clover hay, 5 pounds of bran, and 

 2 pounds of ground oats. Tabulating these materials, as 

 was done in the case of figuring the ration for the steer, the 

 results appear as follows : 



Trial Ration for a 900 Lb. Cow Producing 16.6 Lb. of Milk Daily 



