
New York AGRICULTURAL EXPERIMENT STATION, 121 
REGULARITY OF MILK SECRETION. 
In the ninth annual report it was shown for the cow Flora that 
the average for fifteen days showed that during the night there 
was an hourly secretion of 11.238 ounces, and during the day of 
11.246 ounces of milk, proving conclusively that for this particu- 
lar cow there wasa uniform rate of milk secretion during night 
and day, and that this uniformity was not disturbed by fre- 
quent and decided changes in the times of milking. On the other 
hand with the cow Ann during a period of fifty-eight’ days, the 
~ 
amount of milk secreted per hour during the night was to that 
secreted per hour during the day, as 100 to 98.8, and it is inter- 
esting to compare these results already recorded with the cow 
Flora, since it shows the danger of drawing conclusions from 
results secured from the individual, however carefully ascertained. 
During four days several cows, consisting of two Holsteins, 
three Jerseys, two Ayrshires, one Guernsey and one American 
Holderness, were milked regularly at intervals of twelve hours 
each, or as near that as was practicable, the exact time in each 
case being recorded. There were slight differences in the yield 
per hour, but not uniform for either animal, and the average 
results from these nine cows, of five different breeds, showed that 
the amount, by weight, of milk secreted from 5 P.M. to 5 A. M. was 
the same as that secreted from 5 a. mM. to 5 p. M. during these four — 
days of trial, as will be seen by the following table giving the — 
average results for each day: 
AVERAGE Pounps MILK PER Hoovr. 
' 1} 
Nov. 22. Nov. 23. Nov. 24. Nov. 25. Average. 


Pace nioht...sgi.0s 674 .690 720 701 .696 
AMINO RY .. .. aesns .691 710 705 .693 . 700 

This is a difference of only six-tenths of one per cent more 
during the day. | 
The following table presents the average yield and composition 
_ of the morning’s and evening’s milk of each one of fifteen cows of 
_ six different breeds, and the general average of all. There were 
16 
