118 DISEASES OF SWINE 



the feces and urine for several weeks, and will infect other healthy 

 swine very quickly upon being brought in contact with them. 



(17) Exhibiting at Fairs. — Hundreds of valuable hogs are lost 

 every year, and hundreds of large breeding farms infected, through 

 infection with cholera contracted by show animals while on exhibi- 

 tion at county and state fairs. 



In these expositions large numbers of swine from all parts of the 

 country are brought together and placed in close contact with each 

 other. Almost invariably some animal on the grounds will prove 

 to be infected, and it does not take long for the germs of cholera 

 to become diffused throughout the animals comprising the exhibit, 

 with the result that a few days after arrival home from the fair the 

 show hogs begin to droop, and in a few days a well-developed out- 

 break of cholera is in full swing upon the premises. 



All animals which are intended for show purposes should receive 

 the immunization treatment, preferably the serum-simultaneous 

 method being used, thus rendering them immune to an attack of 

 the disease even if exposed. If this is not done they should at least 

 be shut up in separate pens upon arrival home, and kept so isolated 

 for two or three weeks until all danger from infection has passed. 



(18) Interchange of Boars. — \'erj' often an epidemic of cholera 

 is transmitted from one farm to another through an exchange of 

 boars. In a large number of communities it is a common practice 

 for several farmers to club together and buy a standard bred boar 

 for breeding purposes. This animal is rotated from one farm to 

 another for a few weeks' stay at each place throughout the year. 

 If one of the farms upon which this boar performs service is the 

 seat of an outbreak of cholera, or has recently been an infected 

 premises, the boar may either become sick with the disease or he 

 may merely carry the infected manure and dirt with him to the 

 next farm, and thus start up an outbreak of cholera. 



Boars, before being changed from one farm to another, should 

 be put through the dipping vat, and then should preferably be 

 kept isolated for a week or ten days before being admitted to the 

 herd. 



(19) New Cattle and Sheep. — On large stock farms several car- 

 loads of cattle and sheep are brought on to the premises every year 

 from the large stock markets of the country. In many cases these 



I 



