34 



for the difference in the average yield of milk morning, noon, 

 and evening for the same period. 



These figures show that lot I. gave milk which was consider- 

 ably richer in butter-fat than did lot II. This is a somewhat 

 striking result, as the heavy feeding appears to have lowered 

 the quality of the milk although it has increased the yield. 

 In the preliminary trials, the butter-fat in the milk of lot I. 

 and lot II. respectively was 3'45 per cent, and 3'36 per cent. 

 There was thus only a difference of '09 per cent, in favour of 

 lot I. During the period of the experiment, however, this 

 slight difference was increased to '32 per cent, in favour of 

 the same lot, a result, so far as it goes, totally unfavourable 

 to the heavier ration, if we regard the question from the milk- 

 seller's standpoint. From the butter-maker's point of view 

 the results are slightly different. The actual amount of 

 butter-fat produced by lot II. was 4'58 Ib. per day as against 

 4'25 Ib. in the case of lot I. This means a difference of about 

 2J Ib. of butter-fat per week in favour of lot II. But this 

 difference hardly justifies the use of the heavier ration, which, 

 from every point of view, must be regarded as unprofitable as 

 far as the butter-fat is concerned. 



The morning milk in the case of lot II. was, on the weekly 

 averages, invariably below the legal standard in butter-fat. 

 The morning milk of both lots, however, was below the 

 standard on the average of 12 weeks, but lot I. was by no 

 means so consistently low as lot II. 



Table IY. shows the amount of " solids not fat " in the 

 milk of the two lots during the period of the experiment. 



It will be seen that both in butter-fat and " solids not 

 fat," the milk of lot I. was, on the average, superior through- 

 out the experiment to that of lot II. As showing how milk 

 may vary in quality without much apparent cause, atten- 

 tion may be called to the decrease in the average percentage 

 of " solids not fat " during the last week of the trials. For 

 that week, it is the lowest average throughout the period of 

 the experiment. 



