FEEDING UREA TO DAIRY COWS 



U 



was not intentional — it was resorted to only because the cows, milkuig much 

 longer on the control ration than had been anticipated, had consumed all the 

 corn silage reserved for the experiment the previous spring, and it was a case of 

 feed alfalfa silage or discontinue the trial prematurely. The result, however, is 

 just as impressive as if it had been planned — the cows responded immediately 

 to the additional protein in the alfalfa silage and pulled up to a level comparable 

 with their performance in 1940 and 1941, thus demonstrating their need for more 

 protein than the basal ration contained. 



p£f>ceitrAii£ BASIS 



194! 



1 940 i 41 



l*SEK in LACTATIOH 



Figure 2. Weekly Shrinkajjc in Milk Flow. 

 The record of the six cews fed the "control" ration in 1942 compared with their record during 

 the twc years of the experiment. 



