67 



cases in the tables, but the highest and lowest amounts are 

 also stated when dealing with the butter-fat and " solids not 

 fat." The figures are so arranged as to show the fluctuations 

 which occurred from week to week throughout the two periods. 

 Table XXII. shows the quantity of milk given per day by each 

 lot for twelve weeks. 



It will be remembered that at the end of the preliminary 

 trials, the two lots of cows were very nearly on a level, there 

 being a slight advantage in favour of lot II., and also that 

 during the experiment lot I. received cake and meal, while 

 lot II. received nothing in addition to grass. Bearing this 

 in mind, the similarity between the two lots in the above 

 table is particularly striking. During the first six weeks, 

 there was practically no difference between lot I. and lot II., 

 and even in the second period, when lot I. was receiving 

 double the quantity of cake and meal that it received in the 

 first period, the difference is by no means great, and is con- 

 fined to the last three weeks. When the whole period of 

 twelve weeks is taken into account the difference, on the 

 average, between the total yield per lot per day is slightly 

 over 1J pints only in favour of lot I. Taking the experi- 

 ment as a whole, it would appear that when cows are on grass 

 in the summer, if the pasture is of average quality, there is 

 very little to be gained, as far as the milk yield is concerned, 

 from giving them any extra concentrated food at all, except 

 perhaps a small quantity towards the end of summer when the 

 grass is becoming stale and the nights are getting cold. 



As to the effect of increasing the allowance of cake and 

 meal in the case of lot I., it will be seen that the results hardly 

 justified the change. It is true that the yield from week to 

 week was more regular in lot I. than in lot II. after the in- 

 crease in the food had been made. But this, after all, has 

 nothing to do with the point at issue. The average yield 

 of lot I. during the first six weeks, on 4 Ib. per day of con- 

 centrated food, was slightly over 128 pints per day,, and during 



