464 



PRINCIPLES OF AGRICULTURAL CHEMISTRY 



cow No. 2, the decrease with the period of lactation taking place 

 more regularly. 



EFFECT OF PERIOD OF LACTATION ON QUANTITY AND 

 COMPOSITION OF MILK. 



Age. The quantity of milk appears to increase slightly up to 

 the fifth calf, and then decreases slightly. The fat content ap- 

 pears to remain constant for a long time. 



Frequency of Milking. The more frequently the cow is 

 milked, the greater the quantity of milk, provided the milking is 

 not done so often as to irritate the udder. This is shown by the 

 following experiment of Kaull i 1 



As the udder fills, the formation of milk decreases. There is, 

 1 Ber. d. Landw. Inst., Halle, 1891. 



