i9i i.] Summary of Agricultural Experiments. 855 



follows :— Herd A, i; Herd B, 3; Herd C, 9; Herd D, o. All these 

 were samples of the morning's milk. 



It was concluded previously that the greater poverty of fat in the 

 morning's milk tends to disappear as the intervals in the milkings are 

 equalised, while in very hot weather where the intervals between 

 milking are fairly equal, cows may give richer milk in the morning 

 than in the evening, owing apparently to the greater comfort they 

 enjoy in the coolness of the night. 



It will be seen from Table II. that the average difference between 

 the morning and evening fat-content was the greatest in the case of 

 Herd C for each month, and also that this herd showed the greatest 

 difference in the intervals between the milkings each month, except 

 for July ; this, together with the fact that this herd gave the largest 

 number of samples containing less than 3 per cent, of fat, indicates 

 that one of the most important factors in preventing the morning 

 milk from falling below standard is the keeping of the milking intervals 

 as nearly equal as possible. It is pointed out that the nine mornings 

 on which Herd C gave milk below standard were all during the first 

 ten tests ; the milking intervals differed by 4 hours for the first eight 

 tests and by 35 and 3 hours respectively for the remaining two. 



Table II., 



Showing, for each month, ihe average difference in fat-content of 

 ■morning and evening milk with the average difference between the 

 milking intervals. 



Month. 



Herd A. 



Herd B. 



Herd C. 



Herd D. 



DifiF. in 



Fat. 

 Per cent. 



Diff. in 

 interval. 



Diff. in 



Fat. 

 Per cent. 



Diff. in 

 interval. 



Diff. in 



Fat. 

 Per cent. 



Diff. in 

 interval. 



Diff. in 



Fat. 

 Per cent. 



Diff. in 

 interval. 



April 

 May 

 June 

 July 



C40 

 0-40 

 o'45 



0'12 



3 hours 



2 



2 „ 

 1 hour 



0-50 



o"55 

 0-30 

 o'\6 



2 hours 

 1 hour 



48 mins. 



070 



o*6o 



060 

 0-28 



4 hours 

 4 >> 

 2| „ 

 I* „ 



0-50 

 0'35 



o*35 

 6-18 



2 hours 



2 



2 



2 



It will also be seen that the difference between the morning and 

 evening fat-contents became less as the intervals between milking 

 became more nearly equal. The change is not very striking in this 

 experiment, however, as it is shown also by Herd D, whose milking 

 intervals remained constant. 



With regard to the solids-not-fat it was concluded last year that 

 the percentage is generally higher in the morning than in the evening, 

 and that the solids-not-fat, like the fat, tend to increase in amount 

 as the lactation period advances. 



This conclusion has been supported as the percentage was usually 

 higher in the morning than in the evening, and tended to increase 

 slightly, as the tests went on. 



