CHAPTEK IV 



Causes and Conditions Influencing the Quality and 

 Quantity of Milk 



THE causes which influence the quality and 

 quantity of milk have been much studied, and 

 although many points still remain obscure, a good 

 deal of information has been collected on the 

 subject. In the first place we shall discuss the 

 causes which influence the quantity of milk secreted. 

 Causes Influencing the Quantity of Milk 

 Secreted. The amount of milk yielded by a cow 

 depends on the activity of the milk-glands in the 

 udder ; and this, in its turn, is influenced by a 

 number of conditions. For one thing, it seems to 

 be dependent on the amount of milk the udder 

 contains. Thus, so long as the udder is compara- 

 tively empty, and other circumstances are favourable, 

 the secretion of milk by the milk-glands seems to 

 take place unhindered. But whenever the udder 

 becomes full of milk, the rate at which the secretion 



