324 EFFECT OF ADVANCING LACTATION 



COMPOSITION OF MILK DURING EACH MONTH OF LACTATION. 



classified according to the month of lactation of the cows when the 

 milk was collected, gives the following table : 



With cows at pasture, however, it appears that while the fat and 

 to some extent the proteids of milk show the change described, the 

 amount of solids-not-fat show a general tendency to diminish with 

 advancing lactation. In an investigation ] involving some 2500 

 analyses, conducted by the writer in 1902 May 25 to July 26 the 

 results, when tabulated according to months of lactation of the cows, 

 give as the average values for the solids-not-fat in the milk, the follow- 

 ing figures : 



1 Trans. High, and Agric. Soc. Scotland, 1903, 135. 



