58 



Only the vetch hay actually cousumed is charged, 

 for the reason that Avith most cows the amount of vetch 

 hay left uneaten was very small. The percentages re- 

 jected by five of these cows during the time when 

 large amounts of vetch hay were fed were respectively 

 1, 3, 7, 9, and 9 per cent, of the amount offered. Hazena 

 and Lukie, however, could not be induced to eat the de- 

 sired amount of hay and hence were on rather "short 

 rations" (with corresponding shrinkage in yield) dur- 

 ing the time that they were receiving the vetch ration. 



The greater part of the waste consisted in the case 

 of most cows of the coarser part of the oat plant, which 

 wag mixed with the vetch. 



If the average proportion rejected by five cows, 6 

 ]u:r cent., be regarded as the usual waste and charged 

 to the cows, it would change the relative results only 

 by a small fraction of a cent per day. 



The amount of milk and of butter produced by each 

 cow on both rations are recorded for periods of 3 weeks 

 in the following table: 



Milk and butter in 21 days from ncarli/ equal amounts 

 of vetch and wheat bnni. 



