THE CARE OF SWINE 



433 



the yards really sanitary, and rotate the use of feed lots 

 and pastures, so that they may not become infested. 

 If hogs feed on land that has been continuously used for this 

 purpose, parasites are sure to prevail. One may treat hogs 

 infested with worms as follows, with very satisfactory results. 

 From 3 to 5 grains of santonin and from 5 to 8 grains of 

 calomel, are used for each 100 pounds live weight of pig. 

 The hogs should receive no feed for 10 or 12 hours, after 

 which they are turned to the feed trough in which there is 



Figure 202. A woods-pasture and feed yard for pigs. Photograph by the 



author. 



slightly moistened ground feed, over which the necessary 

 amount of powder has been sprinkled. The hogs should 

 then be kept from other feed for 10 hours or so, in order to 

 give the medicine time to do efficient work. 



External parasites, such as body lice, often become very 

 abundant. These are easily destroyed by giving the skin a 

 brushing of crude petroleum. If many hogs need treatment, 

 they should be driven through a dipping vat, in which water 

 has been filled nearly to the desired height, on the surface 

 of which should be placed about an inch of the crude oil. 

 It is a good plan to spray the interior of the hog plant occa- 



