3 



p . j j Aurora, 2nd. Shorthorn. Milked since March, '91. 



' ' (Clio. Ayrshire. Milked since August, '90. 



f, jj ( Duchess of Hanover. Shorthorn. Milked since March, '91. 



' / Frost. Ayrshire. Milked since Sept., '90. 



C  n TIT i Chinchilla. Ayrshire. Milked since April, '91. 



' ' ' j Maramee. Holstein. Milked since May, '90. 



,. TV ) Duchess. Shorthorn. Milked since Sept., '90. 



' I Duchess, 2nd. Shorthorn. Milked since June, '90. 



THE ANALYSIS OF THE BUTTER 



was confined to the determination of the volatile, fatty acids and 

 the iodine absorption of the purified butter-fat. This course was 

 pursued because the fat is that part of the butter which is least 

 influenced by the processes of the dairy-man, and therefore best 

 shows the effect of the food upon the cow. Furthermore, the 

 flavor of butter undoubtedly depends in great measure upon the 

 quantity of volatile fatty acids present in the butter-fat, and its 

 firmness has been shown to be closelv connected with the amount 

 of oleic acid, which in its turn has been shown to be related to 

 the amount of iodine absorbed by the butter-fat. In general, a 

 butter of a high flavor has a larger amount of volatile acids than 

 one of low flavor, and a soft butter absorbs a greater amount of 

 iodine than a hard butter. 



THE GROUPS WERE FED 



in the first period of this series, a ration containing mixed grain 

 consisting of equal parts of corn meal, cotton-seed meal, gluten 

 meal, and middlings. In the second and third periods, groups I 

 and II were fed to compare the relative effects of corn meal and 

 gluten meal, while groups III and IV were used to find out the 

 action of cotton-seed meal. After the first three periods, the 

 groups were broken by dropping Aurora, Clio, Frost, and Mara- 

 mee from the experiment, and the series was continued with the 

 remaining cows, individually. But as the cows had been tested 

 individually in the previous periods, as well as in groups, the 

 change would not affect the results. 



