COLOSTRUM. 



11 



Colostrum. The milk secreted in the early stage 

 of lactation is rich in proteids (20 per cent, or more) 

 due probably to the incomplete transformation of the 

 epithelial lining of the ducts. A protoplasmic struct- 

 ure known as the colostrum corpuscle is found at this 

 period. The large proportion of proteids is often suffi- 

 cient to cause the liquid to coagulate on boiling. The 

 following is an average composition of colostrum : 

 Fat ...... 3.5 



Proteids . . . . . . 12.7 



Sugar 4.2 



Ash 0.8 



21.2 



The following table is a compilation of published 

 statements of the composition of various milks. 



