130 DAIRY CHEMISTRY 



fodders. There are no stock foods that possess prop- 

 erties for increasing the secretion or flow of milk. 

 The best results are secured by supplying a variety 

 of food stuffs containing a liberal amount of nutri- 

 tive materials. Milk produced under the best sani- 

 tary conditions from healthy and well-fed animals 

 has an individuality, and such milk is specially valu- 

 able for food and for the manufacture of butter 

 and cheese. 



121. Milk Secretion. The materials of which milk 

 is composed are abstracted from the blood, and in 

 order to keep up a good flow of milk suitable food 

 should be supplied, which may be later elaborated 

 into milk. Some animals are so constituted that the 

 food supply is used for the production of fat and 

 increase in weight rather than for milk production. 

 Such animals are not profitable for dairy purposes. 



There are a number of factors that influence milk 

 secretion, as regularity of milking and feeding, 

 manipulation of the udder, exhaustive milking, pro- 

 tection of the animals from sudden changes in tem- 

 perature and adverse climatic conditions, and good 

 sanitary surroundings. These factors all influence 

 the secretion of milk, because the process is largely 

 the result of the working of individual cells which 

 compose the ultimate follicles, and in case the cells 

 are injured or are not given the best conditions for 

 doing their work, milk secretion is decreased and the 

 quality of the product lowered. 



