456 DISEASES OF SWINE 



should anything be fed that may produce irritation of the stomach 

 and bowels, diarrhea, or indigestion. No drugs, sour swill, or other 

 like substances should be given. 



Also leave instructions that no surgical operations, such as cas- 

 tration, ringing, spaying, or anything of that nature, are to be 

 attempted for a least ten days or two weeks after the injection of 

 the serum. It is also a wise plan not to give the serum or serum- 

 simultaneous treatment, and especially the latter, for at least two 

 weeks after the animals have been castrated. 



Herd Number Seventeen. — The herd which formed the basis 

 of the record for the seventeenth of these experimental reports was 

 located in the northeast quarter of Section 3, Union Township. 

 The herd was apparently well when treated on October 17, 1907. 

 Hog-cholera, however, was prevalent on the adjoining farms, and 

 there was constant exposure to danger of infection. 



In carrying out the experiment at this farm 27 head of shoats, 

 averaging 100 pounds or over in weight, were injected. Each 

 of these animals received 20 c.c. of antihog-cholera serum, and at 

 the same time were injected with a dose of 2 c.c. of virulent blood. 

 Six shoats of about the same average weight were left to serve as 

 checks. 



This herd was again inspected by representatives of the bureau 

 station on October 28th. At this time one of the check shoats 

 showed symptoms of cholera. This shoat died a few days later, and 

 it was not long until the other checks in this lot became sick with 

 symptoms of cholera. The herd was again seen on November 26th, 

 and at this time 3 of the checks had died. December 19th, when 

 the final report on this herd was made, 5 of the 6 check shoats had 

 died and the remaining 1 was sick. 



At no time during this experiment did any of the hogs which had 

 been treated show any evidences of being sick, but all remained 

 well and thrifty throughout. 



In this herd we have an excellent example of what may be 

 accomphshed with the use of the simultaneous or double treatment 

 in preventing the outbreak of cholera in a healthy drove. In this 

 herd the animals that received the double treatment remained well 

 not only during an outbreak on the surrounding farms, but also 

 remained perfectly healthy despite the fact that the disease in- 



