SECRETION OF MILK 405 
has been brought to give not only much more milk than 
a calf would require, but to produce it for a very long 
time. Some cows continue to give milk up until even 
another freshening time. Not all cows are of this class. 
Some go “dry” in five or six months; others are persist- 
ent milkers for many months. Persistency of the milk 
function can be encouraged by care in management, by 
feeding rich rations and succulent forage. 
10. Evil of improper milking.—One of the easiest and 
surest ways of checking the milk flow is to leave some of 
the milk in the udder. The least bit of milk remaining 
in the udder cavities is certain to check the activity of the 
secreting cells and to make them lazy. It is a very im- 
portant matter, in getting best results from cows, to re- 
move all the milk, even if considerable stripping is neces- 
sary. Clean milking is a positive necessity for extending 
the milking period. 
11. Regularity of milking —When milk is being drawn 
from the udder, secretion is most active. Milking, there- 
fore, is not solely the removal of the milk 
secreted between milking times, but the 
removal also of what is secreted while 
milking is going on. Mere manipula- 
tion of the udder is inducive of secre- 
tion, although the amount secreted by 
such operation may be small and not 
warranted in comparison with the value of the time so 
expended. The point of most practical importance is 
regularity in the time of milking. Early milking, morn- 
ing or evening one day, and later milking, morning or 
evening another day, not only lessen the output, but tend 
to disturb functional activity and prevent a maximum 
yield for that lactation period. 
SANITARY MILK PAIL 
