20 AGRICULTURAL EXPERIMENT STATION. [Jan. 



Allowing on the other hand in our calculation the com- 

 mercial value of 80 per cent, of the nitrogen, phosphoric 

 acid and potassium oxide contained in the grain feed con- 

 stituents of the different daily fodder rations as obtainable 

 in form of the manurial refuse, we notice that the higher 

 market price of the old-process linseed meal ($27 per 

 ton) as compared with that of the gluten meal ($23 per 

 ton), a difference of four dollars in favor of the latter, is 

 practically offset by the higher commercial value of the 

 manurial refuse obtained when feeding old-process linseed 

 meal, pound for pound, in place of gluten meal in connection 

 with an otherwise corresponding daily diet of milch cows. 

 The net cost of the gluten meal containing daily grain feed 

 ration (periods I., II.) amounts per head to 5.03 cents, 

 while that of the old-process linseed meal containing grain 

 feed portion of the daily fodder rations (period III.) 

 amounts to 4.99 cents, a difference of 0.04 cents in favor of 

 the latter, too small an amount to deserve serious considera- 

 tion from a commercial stand-point. 



Average Quantity of Milk per Day ( Quarts) . 

 [1 quart = 2.15 pounds.] 



An examination of the above-stated average daily yield of 

 milk in case of different cows shows a gradual decline from 

 period to period. The decline in the daily yield of milk of 

 the second period, as compared with that of the first period, 

 varies in case of different cows from .14 to .7G quarts and 

 averages per head 0.4 quarts for the entire herd. The diifcr- 

 ence in the decline of the daily yield of milk, when substitut- 

 ing pound for pound old-process linseed meal for gluten 

 meal in the daily diet (period III.), is as a rule more marked 



