i88 THE farmer's veterinarian 



infection. Special fencing or other provisions 

 should be made wherever practical to keep dogs out 

 of the pens and yards, for, under certain conditions, 

 dogs become verv active agents in spreading the 

 disease. 



The owner of a healthy herd should be very care- 

 ful about buying m hogs for feeding or breeding 

 purposes, and, in the Western states especially, all 

 public stock yards and stock cars must be regarded 

 as possible sources of spread. Hogs coming into 

 the herd for breedmg purposes, if by rail, should be 

 shipped in other than stock cars, and should not be 

 unloaded so as to go through stock yards. All new 

 hogs coming on to a farm where the disease has not 

 appeared, should be kept carefully apart from the 

 herd for from two to three weeks after arrival. 

 The disease may thus have time to develop, if the 

 animals have been infected before shipment or en 

 route. It is decidedly worth while to be careful 

 about clean feeding, for it seems probable that this 

 is a common method by which infection enters the 

 body. This being the case, troughs and feeding 

 floors should be frequently disinfected with steam, 

 boiling water, or a very dilute corrosive sublimate 

 solution (i:i,ooo dissolved in water), with the 

 troughs subsequently rinsed out with plain water. 

 Or the troughs and feeding floors may be disin- 

 fected with any of the coal tar disinfectants if they 

 are used in sufficient strength. These are not 

 poisonous in any probable quantity which hogs 

 would get. 



A Disastrous Experience. — The farmer should be 

 especially careful about buying hogs out of stock 

 yards. Some years ago a certain Minnesota 

 farmer purchased a lot of feeders from Sioux City 

 and took them home to his farm. In about two 



