42 AGRICULTURAL EXPERIMENT STATION. [Jan. 



The remaining fodder articles were sold at the stated price 

 per ton in our local market of feed stuffs. Some informa- 

 tion regarding the raising of vetch and oats and of soja 

 beans will be found farther on in the description of our field 

 experiments. 



Valuation of Essential Fertilizing Constituents contained in the Various 

 Fodder Articles used. 



Nitrogen, 17 cents per pound; phosphoric acid, 6 cents; potassium oxide, 4£ cents. 



Six cows, grades, from five to six years old, and in differ- 

 ent stages of their milking period, were selected for the 

 experiment. They had been fed, previous to the observa- 

 tion, on a daily ration of corn meal, wheat bran and new- 

 process linseed meal, each ?>\ pounds, with all the rowen 

 called for, — from 20 to 22 pounds per head. Their average 

 daily milk record at that time was as follows : — 



from 7.5 to 8 quarts. 

 from 10 to 11 quarts, 

 from 11 to 12 quarts, 

 from 11 to 12 quarts, 

 from 9 to 10 quarts, 

 from 13 to 14 quarts. 



The time of observation was subdivided into three periods, 

 which were characterized by the change from vetch and oats 

 to soja beans, and terminating with rowen, as the sole article 

 of coarse food constituents. The grain feed remained the 

 same during the three different feeding periods. 



