213 



Cow No. 2 is a striking example of occasional 

 extreme variations in milk production, and, contrary 

 to the general statement, the variation in quantity and 

 quality coincide. That is, when she gave a small mess 

 of milk it had. a per cent, of butter fat below her aver- 

 age, while the largest milkings were of her richest 

 milk. This does not hold true in the average per cow 

 calculated from the daily records of three cows, for 

 the reason that the milk of cow No. 1 not given here 

 for lack of space showed just the opposite tendency 

 from cow No. 2. Nearly every time when the milk of 

 cow No. 1 increased in quantity it decreased in per- 

 centage of butter fat ; and as the pounds of milk per 

 day decreased, the per cent, of fat in the milk increased. 

 The milk was richer. 



The record of cow No. 5 on this point shows a very 

 uniform percentage of butter fat from day to day 

 regardless of the quantity of milk produced. 



These individual characteristics may be more con- 

 cisely stated thus : 



Cow No. 1. The richest milk is given when the 

 quantity is small. The quantity decreases somewhat 

 from day to day. 



Cow No. 2. The richest milk is given when the 

 quantity is large. The quantity did not permanently 

 decrease. 



Cow No. 5. The richness of her milk was very uni- 

 form and changed but slightly. The quantity decreased 

 permanently'. 



Beginning June 18th, cow No. 2 was given 5 pounds 

 of wheat bran daily, one week later this was 

 increased to 7 pounds per day. The other two cows 

 got nothing but pasture feed, which gradually grew 

 very short in July on account of the severe drought. 



