160 



NORMAL MILK : ITS ADULTERATIONS, ETC. 



Table XXXI., giving the mean montlily average of morning 

 and evening milk for the past seventeen years, will show the 

 average difierence. 



The mean intervals of milking were 10'8 and 13'2 hours. 



TABLE XXXI.— Composition of Morning and Evening Milk. 

 (1897-1913.) 



Variations on Partial Milking. — The first portions drawn 

 from the udder are known as " fore milk," the last portions as 

 " strippings " ; it is not unusual to find more than 10 per cent, 

 of fat in strippings. The quality of the milk first drawn from 

 the udder is very different from the last portions. Boussingault 

 has recorded the following analyses of milk drawn from a cow 

 in portions : — 



Heaton has also given a remarkable analysis of a partial 

 milking ; it contained only 0*26 per cent, of fat. 



It is sometimes noticed that a cow, through restlessness or 

 nervousness, holds back her milk, especially if the siuToundings 



