164 



HATCH EXPERIMENT STATION. 



[Jan. 



Table III. — Average Composition of Milk. 

 First period : both herds standard ration. 



Composite samples of milk were taken from each herd for 

 five days in each week, and tested for total solids, fat, nitro- 

 gen and ash. The milk from each herd showed no notice- 

 able variations in composition during the first two periods. 

 In the third, or cotton-seed oil period, the milk of Herd I. 

 remained as in the preceding periods, while the total solids 

 and fat of Herd n. showed an increase of about .40 per 

 cent, at the beginning of the period, and this increase main- 

 tained itself until the close of the period. The solids not 

 fat, nitrogen and ash remained unchanged. In the fourth, 

 or Cleveland flax meal period, the milk from Herd I. re- 

 mained practically unchanged, increasing a trifle in all 

 ingredients, due to advanced lactation. In case of the milk 

 from Herd II. the fat decreased to the percentage produced 

 in the second period (before the cotton-seed oil was fed), 



