The valuation of the fodder ingredients is based in this connection, 

 on the average of the local market price per ton ot each article for 

 the entire period of observation. 



The commercial valuation of the fertilizing constituents contained 

 in each fodder article, is based on the following market prices ; i. e. 

 nitrogen (perll>.) 17 cts. ; phosphoric acid, 6 cts. ; and potassium 

 oxide, 4 1-4 cts. Eighty per cent, of the entire amount of fertilizing 

 constituents contained in the fodder consumed are considered ob- 

 tainable by proper management, while twenty per cent, are assumed 

 to be sold with the milk and thus lost to the farm. 



Net cost of the feed represents the sum obtained, by subtract- 

 ing eighty per cent, of the commercial value of the fertilizing con- 

 stituents contained in the fodder consumed, from the total cost of 

 the feed. 



Nothing hut the net cost of feed is considered in the present discus- 

 sion of the cost of production of milk. 



Nutritive ratio of a fodder combination refers to the relative pro- 

 portion of the digestible non-nitrogenous fodder constituents to its 

 digestible nitrogenous food constituents counted as 1 . 



The quantity of the different fodder rations stated below represents 

 in each case the daily average of the amount actually consumed per 

 head during entire feeding period. The variations in the daily con- 

 sumption of the various ingredients of the daily diet in case of differ- 

 ent animals were confined entirely to the fodder corn, the corn sto\er 

 and the corn ensilage when serving as substitutes in part or in the 

 whole for hay, and to hay when fed alone as the coarse or bulky 

 part of the daily diet. The amount consumed in that case was con- 

 trolled by the appetite of the animal, as larger quantities than the 

 figures represent were offered for their consumption. The daily 

 consumption of the grain feed varied in no instance from the amount 

 stated in each case ; the same statement applies to the hay when fed 

 in connection with soine other coarse fodder article as eoi-n ensilage, 

 etc. 



From three to six cows, and at times moie. served at different 

 periods of observation. 



