340 Tw^NTY-FiEST Biennial Eepoet 



this time I am glad to say results so far obtained are 

 flattering. Hog cholera clubs have been organized in a 

 great many counties and in different communities in these 

 counties. At regular intervals these clubs are instructed 

 by experts in the methods which have proved most effec- 

 tive in controlling this disease. There is quite a differ- 

 ence of opinion among authorities on this subject in re- 

 gard to the two popular methods of immunization. Some 

 of our best authorities advocate the simultaneous treat- 

 ment, others again advocate the serum alone treatment. 

 The consensus of opinion, however, favors the serum 

 alone method followed by proper sanitary measures. 

 More or less danger follows the use of the simultaneous 

 treatment, but we know that when serum alone is prop- 

 erly administered no bad results follow, and it is not a 

 hard matter to control outbreaks of hog cholera when 

 proper sanitary measures are followed after the use of 

 the serum alone in infected herds. It is a well known 

 fact that potent anti-hog cholera serum will protect the 

 hog against cholera infection ; duration of the immunity 

 thus conferred varies. A great many herds have been 

 kept free from disease after the use of the serum alone 

 when directly exposed to cholera. The injection of the 

 serum confers an immunity for a sufficient le:ngth of time 

 to thoroughly clean and disinfect the premises, after 

 which there is little or no danger of an outbreak 

 in this herd if communication between these healthy ani- 

 mals and diseased ones in the neighborhood is prevented. 

 Anti-hog cholera serum is manufactured in a great many 

 states in plants controlled by the state. There are also 

 about 125 commercial serum plants in the United States. 

 The serum manufactured at the Kentucky Agricultural 

 Experiment Station at Lexington has been of untold 

 benefit to the hog raisers of this state. This plant was 

 established in 1911 and has been remodeled and enlarged 

 as the occasion has demanded until now we are proud to 

 state that our serum plant compares favorably with any 

 other. From the time of its completion until September 

 1, 1915, 3,790 herds, composed of 156,083 hogs, were 

 treated with serum alone, and serum and virus. In a 

 large number of these herds the disease was so far ad- 

 vanced that only a few were treated, and frequently these 



