18 AGRICULTURAL EXPERIMENT STATION. [Jan. 



feeding period, containing carrots as an ingredient, is thus the 

 most nutritive and also the most expensive. 



The total cost of the feed consumed for the production of 

 milk is lowest wherever corn fodder or corn ensilage have 

 replaced, in the whole or in part, English hay, under other- 

 wise corresponding circumstances. 



The net cost of feed consumed for the production of one 

 quart of milk, during the various feeding periods, varies as 

 widely as from .34 cents to 1.6 cents in case of the same 

 cow. The net cost of the feed is obtained by deducting 80 

 per cent, of the value of the fertilizing constituents it 

 contains. 



The manurial value of the feed consumed during the en- 

 tire feeding experiment, deducting 20 per cent, for the 

 amount of fertilizing constituents lost in the production of 

 milk, is, at current market rates, in every instance, more than 

 equal to one-third of the original cost of the feed. 



Two cows gained from 60 to 66 pounds in live weight 

 during the trial ; and one — the best milker, Dora — ^held prac- 

 tically her own from beginning to end. 



For further details see the following pages. To avoid 

 misconstruction regarding the statement of net cost of milk 

 used in our description, I state once more that it does not 

 include expenses for labor, housing, interest on investment, 

 etc., but means merely net cost of feed after deducting 80 

 per cent, of its manurial value. 



