1895.] PUBLIC DOCUMENT — No. 33. 21 



2. Calculate the rations on the basis of 1,000 pounds 

 live weight. Cows weighing but 700 to 800 pounds will 

 need only seven-tenths or eight-tenths as much. (This is 

 not always true. Example : very thin cows fresh in milk 

 would need rather more, and cows in fair to good condition 

 towards tlie end of lactation less.) 



3. Use 21 pounds of English hay or its equivalent of 

 some other coarse fodder as a basis. (This will furnish 

 1 pound of digcstil)le protein, and it is now necessary to 

 make up tlie necessary amount of protein by the addition 

 of concentrated fodders. In doing this the necessary car- 

 bohydrates not furnished l)y the hay will also be added.) 



4. Use 8 to 10 pounds of two or three different grains, 

 about one-third of each kind. (Not over 3 pounds of corn 

 meal should be added. The various gluten feeds can often 

 take the place of corn meal to advantage. It is almost 

 always economical to use 3 pounds of bran. As the third 

 grain 2 to 3 pounds of one very high in protein should 

 be used, such as cotton-seed meal, or one of the gluten or 

 linseed meals.) 



5. Reduce the quantity of each of the substances to be 

 fed to dry matter, by multiplying by the average per cent, 

 of dry matter in such substances, as found in the tal)les. 



6. Multiply the amount of dry matter in each of the 

 foods by the average percentages of cellulose, fat, protein 

 and extract matter it contains, and these products by the 

 digestion percentages of these same groups. The last prod- 

 ucts will be the amount of digestible cellulose, fat, protein 

 and extract matter contained in each of the several foods. 

 Add the several dio-estible amounts as found in the various 

 foods together, and the sum will be the total digestible cel- 

 lulose, fat, protein and extract matter in all of the feeds 

 going to make up the daily ration. 



7. To calculate the nutritive ratio of the ration, multiply 

 the amount of digesti])le fat by 24, and add the product 

 to the digestible cellulose and extract matter; divide this 

 sum l)y the digestible protein, and the dividend will be the 

 ratio required. 



