22 
BULLETIN 646, U. S. DEPARTMENT OF AGRICULTURE. 
and the premises thoroughly disinfected. New hogs brought to the 
farm should be isolated or quarantined for two weeks before they 
are permitted to run with the herd. 
Hog lice : Hogs, and especially young pigs, often suffer much from 
this cause. When numerous, lice are a serious drain on vitality, 
fattening is prevented by them, and hogs so affected are very much 
more subject to disease. To eradicate lice, dip, spray, or rub hogs 
with crude oil, crude-oil emulsion, or kerosene-oil emulsion every 
10 days for three or four applications. 
Fig. 13.— Disinfecting a hog house. 
Mange: (a) This very troublesome affection with hogs is caused 
by a mite or parasite that pricks the skin of the hog to get tissue 
fluid. This injury produces a red spot which finally results in a 
scale under which mites may be found, (jb) The symptoms are itch- 
ing followed by a loss of hair and thickening and cracking of the 
skin, (c) Treat mange by applying lime sulphur or nicotine dip 
once every 10 days for three dippings. Hogs should be washed thor- 
oughly with soap, water, and brush before dipping, to remove the 
scales. 
Hog cholera : (a) The real cause of hog cholera is a very small germ 
found in the blood or urine. It may be said that anything which 
tends to lower the health of the animal, such as improper feeding, 
insanitary conditions of hog lots, damp or cold sleeping places, and 
