1907.] Milk of Newly-Calved Cows. 



521 



Cow No. 1. — Calved 7th May, 1907. 







Thirst* Dqv 







Morning. 



Noon. 



Evening. 





Per cent. 



Per cent. 



Per cent. 



Water 



78-46 



7Q-zt6 



7Q'76 



Total solids 



21-54 



20-54 



20-24 



Albumen and casein 



14-85 - 



13*05 



10-37 



Milk sugar 



i-8i 



2-37 



2-80 



Ash 



1 -13 



i-i6 



1-24 



Nitrogen ... 



2-33 



2*05 



1-63 



Specific gravity ... 



1-0635 • 



1-0577 •• 



1-049 



The foregoing figures give a good idea of the composition 

 of colostrum for the first whole day after calving. On the 

 average, normal milk contains about the following : — Water, 

 87 per cent. ; casein, 3 per cent. ; albumen, -4 per cent. ; 

 milk sugar, 4-75 per cent; fat, 3-6 per cent. ; and ash, -75 

 per cent. The average specific gravity of milk is 1-032. 

 In all Mr. Collins's results the fat was very irregular and the 

 results with this constituent were worthless to further the 

 objects of this enquiry. The high total amount of albumen 

 and casein is entirely due to abnormal albumen, while milk 

 sugar is considerably under, and ash considerably over, the 

 average. \ ; 



In the following cases the determinations were continued 

 until the sixth or seventh days after calving. The mixed milk 

 is a mixed sample of the two or three milkings of one day. 

 The following contractions are used : M, morning ; N, noon ; 

 E, evening : — 



Cow No. 2. — Calved 20th May, 1907. 







First Day 









1 Day. 

 ed. 









M. 



N. 



E. 



O *H 



w 





is 







Water 



Total solids ... 



Pe, 

 cent. 



77'7 

 22-30 



Per 

 cent. 

 82*32 

 17-68 



Per 

 cent. 

 83-68 

 16-32 



Per- 

 cent. 



Per 

 cent. 



Per 



cent. 



. 



Pet- 

 cent. 



Per 

 cent. 



Albumen and 

 casein ... 

 Milk sugar ... 



Ash 



Nitrogen 



17-50 



1- 64 

 0-48 



2- 78 



12* 14 



3'22 

 0-96 

 I -90 



10-34 



3*8i 



o-68 

 1 -62 



7'40 



3-75 

 i-i6 



Tsr 



4-40 



0-92 



5-23 

 4-87 

 0-82 



4'53 

 4-25 

 0-71 



4-27 

 4-28 

 0*67 



Specific gravity 



1 -0682 



I-0553 



1-0523 



1*0470 



1-0397 



1-0384 



1-0385 



I-Q375 



