BUREAU OF ANIMAL INDUSTRY. 



127 



the fall of 1914 interfered with this work to some extent and made 

 it necessary to drop two of the counties in which the work had been 

 established. Leaving those two counties out of consideration, the 

 work has been conducted in the following counties : Decatur County, 

 Ga. ; Twin Falls County, Idaho ; Hendricks and INIontgomery Coun- 

 ties, Ind. ; Clay and Dallas Counties, Iowa ; Marshall County, Kans. ; 

 Henderson County, Ky. ; Branch County, Mich.; Renville County, 

 Minn.; Pettis County, Mo.; Gage and Johnson Counties, Nebr. ; 

 Muskogee County, Okla. ; Davison County, S. Dak.; Maury County, 

 Tenn. 



At each of these stations the work is conducted by one veterinary 

 inspector in charge, with two assistant veterinarians and one clerk. 

 The total force employed in the field was approximately 60 men. 

 The serum used was prepared at the department's serum plant at 

 Ames, Iowa, and was applied in the selected areas by department 

 inspectors free of charge to farmers. 



The methods employed in these counties have been purposely varied, 

 as the problems to be met have been found to be different in different 

 localities. In some counties all of the inoculation work has been done 

 with the serum alone. In other counties the simultaneous! method 

 (serum and virus) has been used in conjunction with the serum alone. 

 In these latter counties in an infected herd the apparently infected 

 hogs were given the serum alone, whereas the hogs which appeared 

 well at the time of treatment were given the simultaneous inocula- 

 tion. 



The bureau's men have had the cooperation of State authorities. 

 The State college in many cases has undertaken to make a survey of 

 the area, collect statistics, and assist in general educational work 

 in the county. The State veterinarian or the State live-stock sani- 

 tary board has undertaken the duty of enforcing the necessary 

 quarantine and sanitary measures and supervising the disinfection 

 of infected premises. 



These county experiments are not intended primarily to demon- 

 strate hoAV to eradicate or control hog cholera, but they are rather a 

 series of experiments on a large scale to ascertain the best and most 

 practicable methods for the control of hog cholera. 



Some of the results up to the end of the calendar year 1914 follow. 



The first table shows the results following the treatment of herds 

 which w^ere apparently well when treated, but which were regarded 

 by the field inspectors as exposed. They were usually hogs on farms 

 in the immediate vicinity of an infected herd. In the exposed herds 

 the losses following the serum-alone and simultaneous methods are 

 insignificant in both cases. The slight difference in favor of the 

 latter is too small to be regarded as indicating the superiority of 

 either method over the other. 



Results of scrum treatment in exposed herds of hogs apparently well when 



treated, IdlS-l). 



