EFFECT OF MILKING EVERY FOUR HOURS. 323 



Average milk 



No. of . . Days since calving Weight Tuberculin test yield. 



Cow. A e e> to April 1. in ft. indication. a.m. p.m. 



Ib. Ib. 



66 38 1196 29 18 



73 88 1008 17 12 



83 83 878 Free 15 10 



95 30 1354 ,, 20 15 



10 3 Not milking 1354 



11 7 ,, 1380 Affected 



12 3 223 992 15 8 



13 4 221 1322 ,, 10 6 



14 3 157 1092 15 10 



15 4 154 1196 Free 19 12 



16 4 154 1248 ,, 13 8 



17 4 14 986 ,, 18-5 13 



18 4 14 1008 25 15 



19 4 10 1036 Affected 24 17 



Mean yield of whole herd ... ... 308 202 



The investigation commenced with the evening's milk of 

 March 22 and ended with the morning's milk of April 12, 

 1900. The cows were milked at about 6 a.m. and 3 p.m. 

 Each cow received daily 3R>. cotton-seed meal, 3R). maize 

 meal, 31b. bran, 2R). wheat meal, and chaff and hay ad lib. 



By milking several cows four times a day at intervals of 

 six hours and analysing the milk the following figures were 

 obtained : 



Time of milking. 



5 a.m. 11 a.m. 5 p.m. 11 p.m. 

 Ib. Ib. ft. ft. 



Percentage of fat in milk (mean)... 2-8 3-6 3'5 3'0 



Weight of milk secreted (total) ...40-0 23-5 24-0 24-0 



(ratio) ... 1-0 0'59 0'60 0-60 



Weight of fat yelded (total) ... 1-1 0'85 0*82 0'70 



(ratio) ... 1-0 0'77 0'75 0-64 



From these results it appears that the milk secreted between 

 5 a.m. and 5 p.m. is much richer in fat but smaller in quantity 

 than that secreted at night, and that by far the largest amount 

 is secreted in the six hours after 11 p.m. Other experiments 



Y 2 



