Hog Lice and Hog Mange: Methods of Control and Eradication. Page: 1
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HOG LICE AND HOG MANGE
METHODS OF CONTROL AND ERADICATION
MARIoN IMES, Veterinary Inspector,.
Zoological Division, Bureau of Animal Industry
Hog lice------------------------- 1 Treatment for lice and mange..------ 9
Distribution and economic im- Hand applications------------ 9
portance_--------------- 1 Spraying -------------------- 10
Nature and habits------------- 2 Hog oilers .------------ 10
Hog mange ---------- - 3 Medicated hog wallows ---------10
Varieties and general character- Dipping --------------------- 12
istics 8--------------------- 3 Construction of hog wallows-------- 16
Sarcoptic or common mange-_ 3 Construction of dipping plants . - 18
Demodectic (follicular) mange_ 8
DISTRIBUTION AND ECONOMIC IMPORTANCE
Hog lice occur more or less frequently on both domesticated and
wild hogs in practically all parts of the world. The parasites are
prevalent in all parts of the United States where hogs are raised,
and livestock growers generally recognize them as a pest that causes
considerable loss to the swine industry.
In obtaining their food the lice puncture the skin of the host
animal and suck blood and lymph. A new puncture in the skin is
made each time a louse feeds. A single puncture causes considerable
irritation and itching, and as each louse feeds at frequent intervals,
the irritation'and itching is almost constant in cases of gross in-
festation. In an attempt to relieve the intense itching the infested
animals scratch themselves with their feet and rub violently against
any convenient object. The frequent rubbing destroys the hair in
patches and often causes wounds in the skin. The lice congregate
around the abrasions and thus cause further irritation.
Lice may attack hogs of any age or condition, and if allowed to
spread the infested animals suffer and the owner loses in the increased
quantity of feed consumed per pound of gain, arrested growth of
young pigs, and shrinkage in weight of fattening hogs. When
young pigs become infested at an early age from the brood sow
and the lice are allowed to remain on the animals until the hogs
are ready for butchering, the loss caused by the parasites is a con-
siderable item in the cost of producing pork. Estimates based on
observations and limited experimental data fix the direct money loss
in such cases at from 2 to 6 per cent of the market value of the hog.
The indirect losses caused by lice are seldom taken into considera-
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Imes, Marion. Hog Lice and Hog Mange: Methods of Control and Eradication., pamphlet, 1924; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc85973/m1/3/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.