140 



A careful study ofthe foregoing data will reveal : Ist, how individuals of the same 

 breed differ in the quantity and quality of their milk — a difference no doubt partly 

 due to the varying ages and lengths of time since calving of the individuals tested ; 

 2nd how the same cow will vary in the richness of her milk within a comparatively 

 short period of time ; 3rd, how — except in the case of the Aberdeen Angus, of whom 

 only 4 samples were analysed — the evening milk was invariably the richer, though 

 less in quantity, of the two. Further experiments are required to prove if this 

 difference remains when the intervals between the milkings are more equal. 



From the results of these analyses, the following instructive table of averages 

 has been prepared in which will be found : First, the average composition of the total 

 number of milks; next the averages for the whole number of the morning and 

 evening milks respectively ; next follow the average composition of the milk of the 

 different breeds — morning and evening milk taken together ; and finally, the averages 

 of the morning and evening milks separately of the different breeds. The order of 

 the first table has been preserved. 



Table of Milk Averages. 



Average composition of 93 samples 



do morning samples 



do evening samples 



do Jersey 



do Holsteins '. . . 



do Ayrshire 



do Aberdeen Angus 



do Shorthorn 



do Grades 



do Jersey (morning) 



do do (evening) 



do Holstein (morning) . . , 



do do (evening) . . . 



do Ayrshire (morning) . . 



do do (evening) . . 



do Ab. Angus (morning) 



do do (evening) 



do Shorthorn (morning) 



do do (evening) . 



do Grade (morning) 



do do (evening) 



Specific 

 Gravity. 



Total Solids. 



1033 



1033-4 

 1032 7 

 1033-2 

 1032-4 

 1032-5 

 1036 

 1033-4 

 1033-9 

 1033-7 

 1032-7 

 1032-6 

 1032-1 

 1032-7 

 10.32 -3 

 1037-4 

 1034-7 

 1033-8 

 1033-0 

 1033-9 

 1033-9 



13-20 

 12-91 

 13-49 

 14-80 

 12-24 

 12-94 

 14-17 

 13 00 

 13-95 

 14-18 

 15-43 

 11-88 

 12-54 

 13-61 

 13 18 

 14-51 

 13-82 

 12-70 

 13-30 

 13-65 

 14-36 



Fat. 



Solids 

 not Fat. 



13 



78 

 47 

 58 

 40 

 99 

 45 

 87 

 46 

 84 

 32 

 08 

 42 

 73 

 20 

 52 

 38 

 51 

 22 

 19 

 82 



07 



13 

 -02 

 -22 

 -74 

 -95 

 •72 

 •13 

 -49 

 -34 

 -11 

 -80 



12 

 -88 

 -92 

 •49 

 -44 



19 

 -08 

 •46 

 -54 



What has already been said with regard to the richness of the evening milk is 

 here very apparent. The averages of the total morning and evening milk show that 

 the percentage of fat in the latter exceeds that of the former by -69 per cent. At the 

 same time it is to be noticed that the increase in total solids in the evening over the 

 morning milk is '58 per cent. From this it would seem that the " solids not fat " 

 decrease somewhat as the percentage of fat increases, i. e. ; that fat is developed at 

 the expense of one or more of the other constituents. 



The averages of the morning and evening milk of the Shorthorns, Ayrshires and 

 Jerseys are all in accord with this deduction. 



