A STUDY OF RATIONS FED TO MILCH COWS. 41 
although the milk flow in the second test for some reason 
dropped off to an unusual degree. ‘The general tendency of 
rations high in protein in nearly all of our experiments has 
been to keep up the milk flow and lessen the natural shrinkage. 
The average percentage of butter-fat in the second test was 
increased by four-tenths of one per cent. ‘This made the total 
yields of butter-fat about equal in the two tests. ‘The total 
cost of the second ration was slightly less than that of the 
first ration. For the production of milk this second ration, 
however, proved unprofitable. (See table 10.) We can hardly 
_ ascribe the shrinkage in milk flow to any aversion of the cows 
to the fodder. The cows seemed to eat their rations readily. 
We have much yet to learn, however, regarding the palatability 
of different feeds, and it is possible that the grain ration fed in 
the second test may not have been relished by the cows as 
well as that fed in the first test. Of course the relatively 
small milk yield with this ration may be due to causes not 
yet understood. The relations of large amounts of protein 
to the milk production and the health of the animal is a subject 
which demands careful study. 
Dairy Flerd M.— Tests 44 and 46.—Calculated per average weight 
of herd (725 pounds). 


Revninc STUNTS | DIGESTIBLE NUTRIENTS AND 











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