32 



MILK HYGIENE 



ing milk in that the latter is richer in fat than the for- 

 mer. Numerous investigations have given very varia- 

 ble results that may be explained by the short duration 

 of the test, by the daily variations of the composition 

 of the milk, etc. Some larger experiments relating to 



LACTATION PERIOD 



many animals and extending over a long period, have 

 proven that the morning milk does not differ from the 

 evening milk in fat content when the period between 

 the milkings is equally great and the feed, the amount 

 of drinking water taken, etc., are the same. But in prac- 

 tice this is not the case, because usually a small dif- 

 ference exists, so that where there is a larger quantity 



