VARIATION OF FAT IN MILK 73 
According to experimental evidence, milk drawn with a 
machine contains more bacteria than milk drawn by hand. 
This is claimed to be due to the suction on the exterior of the 
teat, and to the tubes through which the milk must pass after 
it is drawn. 
Fore-milk and After-milk.— The fore-milk, or the milk 
drawn from the cow’s udder first, contains much less fat than 
does the milk drawn subsequently. The very first milk drawn 
Fic, 22—Milking goats in Norway. 
appears watery and contains as little as 0.1% of fat, while 
tue very last milk in the udder may contain as high as 12%. 
The reasons assigned for this variation are (1) the milk in 
the canal of the teat, and lower portion of the milk-reservoir 
is present under such conditions as to allow creaming to proceed. 
(2) The larger fat-globules are about as large as the smaller 
milk-dusts in the cow’s udder; consequently the downward 
passage of these fat-globules meets with some obstruction 
