animal diseases, hog, lice, mange, animal husbandry department
Cooperative Extension Service, South Dakota State College of Agriculture and Mechanic Arts
External Parasites of hogs cause an extensive loss to the hog industry. A hog that spends all of his time scratching instead of eating does not do well. These parasites set up such an irritation that the hog is constantly rubbing he will not take on flesh rapidly. Hogs that are infested with external parasites do not sell well on the market because when they are butchered they are very hard to scrape. Furthermore, a No. 1 ham cannot be made from a mangy hog because it is necessary to take the skin off the ham.
Weaver, G. S., "Hog Lice and Hog Mange" (1926). SDSU Extension Circulars. 236.