10 



BULLETIIT 1097, U. S. DEPAETMEXT OF AGRICULTURE. 



and odors present were described as " slight feed," " feed," " silage," 

 and '" strong feed." 



During the latter part of this experiment it became necessary to 

 use silage which had been in the silo for four or five years. This 

 silage had a milder flaror than the 8-month-old silage fed in 10- 

 pound lots during the previous experiment, and gave the milk a 

 milder silage flavor. This suggests that the degree of odor present 

 in the silage helps to determine the degree of feed flavor and odor 

 imparted to milk, 



EFFECT OF AEEATIOX. 



After the samples of milk from the silage-fed cows were taken, the 

 remaining milk, while still warm, was aerated by passing it over 

 a surface cooler. Although diminished by aeration, the feed odor 

 was still present in sufficient degree to be noted in over TO per cent of 

 the flavor examinations and in 80 per cent of the odor examinations. 



Table 4 also shows the conditions noted in the check samples from 

 cows not fed silage. The terms used by the judges in describing the 

 flavor and odor in these samj)les were " natural," " normal," " good," 

 and " excellent." In no cases were the judges able to detect any 

 feed flavor or odor in the milk drawn from the cows not receiving 

 silage. This agrees with previous work covering this phase. 



It is apparent that feeding 20 pounds of corn silage one hour before 

 milking does affect the flavor and odor of milk to an appreciable 

 extent. It is also apparent that aeration diminishes the degree of 

 the feed odor imparted by the silage. The experiment further sug- 

 gests that when 20 pounds of 5-year-old silage are fed, sufficient will 

 pass through the body to affect the taste and smell of the milk pro- 

 duced. '\^"liile the feed flavor and odor in this milk were sufficiently 

 prominent to be apparent to some consumers, it was the opinion of 

 the judges that after aeration it would be accepted in a great many 

 cases without complaint on the part of the consumer. 



5. FEEDING 30 POUNDS OF CORN SILAGE BEFORE MILKING. 



The quantity of silage was next increased to 30 pounds per cow. 



Table 5. — Effect of feeding 30 poutulft of corn silage once a day one hour before 



vMIking. 



Result of sampling. 



Arillr frnm 

 sila 



cows fed 



ge. 



Millr from 

 cows not 

 fed silage. 



Before | 

 aeration. 



After 

 aeration. 



Nimihpr of fxi^TTiiTis^tioTis 



46 



46 



46 







Off flavor 



46 I 

 ' 



46 

 



1 



No off flavor 



45 







Ofl odor 



46 

 



46 

 



1 



N off odor 



45 









