APPROXIMATE FERTILIZER IXfiREDIENTS IN TOTAL RATIONS. 

 Distillers'^ Grai)i Ration. 



117. 2 lbs. nitrogen valued at $19.92 



64.4 " potash " 3-22 



27.7 '• phosphoric acid valued at i.ii 



Total $24.25 



Buffalo Gluten Feed Ration. 



108.7 I'^s. nitrogen valued at $18.48 



63.5 " potash " 3-i8 



28.2 " pliosphoric acid valued at 1.13 



Total $22.79 



The distillers' grain ration contained about 7 per cent more 

 nitrogen than the Buffalo gluten feed ration, due to the excess of 

 protein in the distillers' grains, and similar quantities of potash and 

 phosphoric acid. This proportion would hold true in the manures 

 produced by the two rations. 



(e) EFFKcr OF Distillers' Grains on Flavor and Keeping 

 Quality of the Milk. 



Samples of each cow's milk were frequently taken and preserved 

 immediately in sterilized glass-stoppered bottles. It was not possible 

 to detect any objectionable flavor or odor in the fresh milk produced 

 by the cows receiving the distillers' grains. 



Within a few hours after milking, 25 cubic centimeters of the 

 cooled milk were titrated, against yL normal soda, 4 to 5 cubic 

 centimeters of which were required to neutralize the natural milk 

 acidity. Slight differences were observed in the amount required to 

 neutralize the milk produced by the different cows, but no variation 

 was noted that could in any way be attributed to the effect of the 

 distillers' grains. The milk was allowed to stand for 72 hours in the 

 laboratory, the temperature of which was about 70^ Fahr. during the 

 day and 60° Fahr. at night, and was tested for acidity at intervals 

 during this time. For the first 48 hours very little increase in 

 acidity was noted; the milk continued to have a sweet but slightly 

 old taste. During the last 24 hours the acidity began to increase 

 slowly at first and rapidly towards the end of the period. Curdling 

 generally began when 8-10 c. c. of alkali were required to neutralize 

 25 c. c. of milk, and samples that required 1 5 c. c. of alkali had a 



