CHAPTER II 



Composition of Milk 



MILK contains all the food elements and in the 

 proper proportion for the development of the young 

 animal. The proportion of each differs in the milk 

 of different species of animals and of different in- 

 dividuals in the same species. It also varies from 

 season to season and from day to day. Some varia- 

 tions are accidental, due to immediate environment ; 

 others seem designed to meet the requirements of 

 the young growing animal for which it is the food ; 

 while others are characteristic of the breed and 

 the individual. The following diagram represents 

 the average composition of cow's milk, indicating 

 also the principal portion of the body to the de- 

 velopment of which it contributes : 



" Water 87$. For the water of the body. 



(Fat 4% \ For heat 



f Sugar 5% f and fat f Muscle 

 I Casein 3% ) Protein J e ? don 

 Solidsnot| Albume -44 for j g^ 

 Fat 9$ LAsh .6% For bone LHorn 



The following shows the extreme percentage of 

 each constituent as given by Koenig : 



Maximum Minimum 



Water 90.69 80.32 



Fat 6.47 1.67 



Casein 4.23 1.79 



Albumen 1.44 0.25 



Sugar 6.03 2. ii 



Ash i. 21 0.35 



