THE CHEMICAL COMPOSITION OF MILK 



19 



• 



No. 



OF 



Anal- 



Specific 

 Gravity 



Water 



Casein 



Albu- 

 min 



Total 

 Pro- 



Fat 



Milk- 

 sugar 



Ash 





yses 



















Cow's milk 



800 



















Minimum 





1.0264 



80.32 



1.79 



0.25 



2.07 



1.67 



2.11 



0.35 



Maximum 





1.0370 



90.32 



6.29 



1.44 



6.40 



6.47 



6.12 



1.21 



Mean 





1.0315 



87.27 



3.02 



0.53 



3.55 



3.64 



4.88 



0.71 



Human 





















milk 



200 



















Minimum 





1.027 



81.09 



0.18 



0.32 



0.69 



1.43 



3.88 



0.12 



Maximum 





1.032 



91.40 



1.96 



2.36 



4.70 



6.83 



8.34 



1.90 



Mean 







87.41 



1.03 



1.26 



2.29 



3.78 



6.21 



0.31 



Goat's milk 



200 



















Minimum 





1.0280 



82.02 



2.44 



0.78 



— ■ 



3.10 



3.26 



0.39 



Maximum 





1.0360 



90.16 



3.94 



2.01 



— 



7.55 



5.77 



1.06 



Mean 





1.0305 



85.71 



3.20 



1.09 



4.29 



4.78 



4.46 



0.76 



Ewe's milk 



32 



















Minimum 





1.0298 



74.47 



3.59 



0.83 



— ■ 



2.81 



2.76 



0.13 



Maximum 





1.0385 



87.02 



5.69 



1.77 



■ — 



9.80 



7.95 



1.72 



Mean 





1.0341 



80.82 



4.97 



1.55 



6.52 



6.86 



4.91 



0.89 



Mare's 







1 















milk . 



47 



















Mean 





1.0347 



90.78 



1.24 



0.75 



1.99 



1.21 



5.67 



0.35 



Ass's milk 



5 



















Mean . 





1.036 



89.64 



0.67 



1.55 2.22 



1.64 



5.99 



0.51 



VARIATIONS IN NORMAL COW S MILK 



While the composition of milk is quite stable, all the con- 

 stituents are more or less variable — even in normal milks. 

 Koenig gives the following variations of the different constitu- 

 ents based on his study of several hundred samples collected 

 from many sources. 



Average Variation in Constituents of Cow's Milk 



(Koenig) Maximum Minimum 



Water 90.69 80.32 



Fat 6.47 1.67 



Casein 4.23 1.79 



Albumin 1.44 .25 



Sugar 6.03 2.11 



Ash 1.21 .35 



