PARASITIC SKIN DISEASES.

MANGE

Is caused by a minute acarus, peculiar to cattle, which
burrows itself in the skin. It usually first appears on the

Fig. 125. The mite or acarus known as Dermatodectes bovis. Magnified.

withers and the root of the tail, whence it spreads. The
parasite may sometimes be seen in the removed scurf with

2S2

THE DISEASES OF CATTLE.

the naked eye. If it cannot, use the microscope to be
sure as to the exact cause of the trouble. The hair of a
mangy ox comes off here and there, and the removal of
the dry scales reveals small, raw pimples, which dis­
charge a yellowish, watery fluid. In chronic cases the
skin becomes thick and folded. The disorder is peculiar
to badly kept and debilitated animals.

Fig. 126. The mite or acarus known as Symbiotes Bovis. Magnified.

Remedy.-—1. Sulphur, 1 oz., lard, 1 oz. 2. Oil of
stavesacre, 1 dram, lard, 1 oz. Either of these, or com­
bine the two with 20 grains of white precipitate of mer­
cury. Wash with carbolic acid soap and water before ap-.

PARASITIC SKIN DISEASES.                         283

plying ointment. Use ointment every other day till cured.
Separate affected animals. Disinfect premises.

Fig. 127. A piece of mangy skin.

RINGWORM

Is caused by two kinds of fungus. A number of round,
scabby patches appear, usually about the head and eyes,
giving the animal a hideous look. The rings may unite
and form large patches. If the scabs are peeled off, a
raw surface is exposed, whence a yellowish fluid exudes,
by the drying of which the scabs are formed. The dis­
ease is contagious.

Fig. 128. Ringworm.                  Fig. 129. Another specimen same.

Remedy.—Ointment of iodine, or ointment of acid

284

THE DISEASES OF CATTLE.

nitrate of mercury, or oleate of copper, 1 part, lard 5
parts. Lotions: 1. Sulphurous acid, 1 dram, glycerine,
3 drams. 2. Perchloride of mercury, 1 part, water, 500
parts. 3. Vinegar of cantharicles.

LICE

May be killed with white precipitate of mercury, 1 part,
lard, 12 parts; or, stavesacre seed, ½ oz., soft soap, 2 oz.,
the bruised seed being boiled with the soap in a pint and
a half of water till only one pint remains. Tobacco in­
fusion is also good.

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