70 AGRICULTURAL EXPERIMENT STATION. [Jan. 



Average cost of cow (twelve) , $G2 29 



Average selling price of cow, 



Average of total cost of feed per clay, .... 

 Average product jser day for entire observation, per 



head, . . 



Average of net cost of feed per day, .... 

 Average of value received above net cost of feed and of 



cow, per day, 



Average of value received in form of manure, pev day, 

 Average of value received in form of cash, per day, 



The average yield of milk at the end of the ninth month, 

 since day of calving, was sixty-one per cent, of original yield. 

 The shrinkage in the temporary market value of cow varies 

 from five to eleven and four-tenths cents per day, and aver- 

 ages eight cents per head in our case. 



The net cost of the feed consumed is obtained by deduct- 

 ing eighty per cent, of the current commercial value of the 

 essential fertilizing constituents contained in the feed from 

 the market cost of the feed. See — 



Bessie. 



Mai'ket value of feed consumed, f ,59 00 



Value of manure obtainable, 22 27 



Net cost of feed, ........ f 3G 73 



The total value olitaincd for the feed consumed is ascer- 

 tained by adding the value secured from the sale of milk 

 produced to the commercial value represented in the manure 

 obtainable. See — 



Bessie. 

 Value of milk sold, ......... $111 73 



Value of eighty i)er cent, of the manurial substances in the 



feed, 22 27 



Total value obtained from feed consumed, . . . flS-l 00 



The total value secured from any individual cow, after net 

 cost of feed and of cow has been accounted for, is represented 

 by subtracting the sum resulting from the addition of the 

 difierence between the original cost of the cow and its selling 

 price, and of the total cost of feed consumed, from the total 

 value obtained in form of milk and manurial refuse. See — 



