42 REPORT OF DEPARTMENT OF ANIMAL HUSBANDRY OF THE 
milk fat secretion, whether this fat is derived wholly from fats 
previously formed in the plant or from protein, or whether car- 
bohydrates may support its formation either directly or through 
the previous formation of body fat. 
The tables which immediately follow give the daily nitrc en 
and fat balance for the three cows. From these tables various 
summaries are derived which show the bearing of the evidence 
secured. 
