748 



Journal of Agriculture, Victoria. [11 Dec, 1916. 



show a much greater decrease in the average weekly flow of milk than 

 those comprising Lot II. This was no doubt due to the fact that one 

 of these cows continued rapidly to go off her milk, as at the end of the 

 experiment on 22nd September, she was only giving 2 quarts per day. 

 This smaller flow of milk is therefore due to the individualitv of the 

 cows and not to the difference of the milking periods. On the other 

 hand Table LXXIX. shows that the quantity of milk given at the 

 evening's milking, by equal milking periods is greater than at the 

 morning's milking. A result which strikingly confirms the one shown 

 in the previous experiment. 



Table LXXIX. — Aveeage Quantity of Milk in Pints per Lot per 



Day for Six Weeks. 



Quality of the Milk. — If the deductions with regard to the more 

 even quality of morning's and evening's milk from equal periods made 

 from the previous experiment were sound, it would naturally be 

 expected that when the milking periods were reversed for the two lots 

 of COWS the results of Experiment V would confirm the previous one. 

 Table LXXX. shows this confirmation in a very satisfactory manner. 

 In every case but one of Lot II. (equal periods) the percentage of fat 

 is greater in the morning's milk than in the evening's. The actual 

 difference in favour of the better morning's milk for the average of the 

 six weeks is .18 per cent., while in the case of Lot I. (unequal milkings) 

 the morning's milk is on the average of the whole period .68 per cent, 

 poorer than the evening's. The differences are not quite so great as in 

 the previous experiment, but, having regard to the more advanced 

 period of lactation of both lots of cows, is quite consistent. This more 

 advanced lactation period also no donbt partly explains why the actual 

 number of times the milk of cows in Lot I. (unequal periods) only fell 

 six times below the 3 per cent, limit in the morning as compared with 

 twelve in the previous experiment, and once in Lot II. (equal periods) 

 at an evening's milking as compared with twice in the previous experi- 

 ment. The lowest percentage of fat with both lots of cows was further 

 not so low as in the previous experiment. 



