Congenital Infections of Calves 679 



upon raw milk for ten or twelve days and then placing it 

 upon boiled milk. Such calves regularly do well, and the 

 logical explanation would appear to be that the raw milk 

 allowed for a limited time enables the calf to develop a 

 resistance to the bacteria present, after which the protective 

 substances are not required. As a result of these researches 

 I have advised, and have found the advice good in actual 

 practice, that the calf be fed raw milk from its dam until 



Fig. 210 — Chart of Calf No. 71, fed upon autoclaved milk. 



