41 8 THE MANAGEMENT AND FEEDING OF CATTLE 



well known to be affected the preceding summer is in- 

 jected immediately under the skin of the animal to be 

 inoculated. The best age for such inoculation is 9 to 

 15 months, and the best season is the three winter 

 months. In this way the percentage of loss from this 

 class of animals is greatly reduced. Another method is 

 to bring such animals within the area under the age of 

 four months, and to allow them to become immunized 

 like native cattle by tick infestation. 



