Chapter 39

_Symptoms._--The formation of a blister is preceded by a congestion or swelling of the skin. Yellowish-colored water collects beneath the cuticle, which raises the latter from its bed in the form of a blister. The blisters appear in a succession of crops; as soon as one crop disappears another forms. They usually occur in clusters, each one being distinct, or they may coalesce. Each crop usually runs its course in a week. The disease is attended with itching or burning sensations which cause the animal to rub, thereby frequently producing excoriations and formation of crust on the affected region.

_Treatment._--Give a tablespoonful of the following-described mixture in feed twice a day: Saltpeter, cream of tartar, and sulphur, equal parts by weight. The blisters should be opened as soon as formed, to allow the escape of the serum, followed by a wash composed of chlorid of zinc, 1 dram to 15 ounces of water. When there is any formation of crusts, carbolized cosmoline should be applied.

FURUNCULUS (BOILS).

This is an acute affection of the skin, usually involving its whole thickness, characterized by the formation of one or more abscesses, originating generally in a sebaceous gland, sweat gland, or hair follicle. They usually terminate by absorption, or by the formation of a central core, which sloughs out, leaving a deep, round cavity that soon heals.

_Causes._--Impoverished state of blood, the result of kidney diseases or of local friction or contusions, with the entrance of pus cocci through the damaged skin or through a hair follicle or a sebaceous gland.

_Symptoms._--Boils in cattle usually appear singly, not in clusters; they may attain the size of a hen's egg. The abscess begins as a small round nodule, painful on pressure, gradually increases in size until death of the central portion takes place, then the surface of the skin gives way to internal pressure and the core is released and expelled. Constitutional symptoms are generally absent, unless the boils occur in considerable numbers, or by their size involve a great deal of tissue.

_Treatment._--Poulticing to ripen the abscess. If this can not be done, apply camphorated oil two or three times a day until the core is formed. As soon as the central or most prominent part becomes soft, the abscess should be opened to release the core. Then use carbolized cosmoline once a day until the healing is completed. If the animal is in poor condition, give tonics--copperas, gentian, ginger, and sulphur, equal parts by weight, 1 tablespoonful twice a day. If the animal manifests a feverish condition of the system, give half an ounce of saltpeter twice a day, continuing it several days or a week.

FAULTY SECRETIONS AND ABNORMAL GROWTHS OF THE SKIN.

PITYRIASIS (SEBORRHEA, DANDRUFF, OR SCURF).

This is a condition characterized by an excessive secretion of sebaceous matter, forming upon the skin in small crusts or scales.

_Causes._--It is ascribable to a functional derangement of the sebaceous glands, usually accompanied with dryness and loss of pliancy of the skin. The animal is hidebound, as it is commonly termed, thin in flesh, inclined to rub, and very frequently lousy. The condition is observed most often toward the spring of the year. Animals that are continually housed, and the skins of which receive no cleaning, generally present a coat filled with fine scales, composed of epithelium from the epidermis and dried sebaceous matter. This, however, is a physiological condition and compatible with perfect health.

_Symptoms._--Pityriasis may affect the greater portion of the body, though usually only certain parts are affected--the ears, neck, rump, etc. The skin becomes scurfy, the hairy coat filled with branlike gray or whitish scales.

_Treatment._--Nutritious feed, such as oil-cake meal, bran, ground oats, and clean hay. In the spring the disease generally disappears after the animal is turned out to pasture. When lice are present they should be destroyed.

ELEPHANTIASIS (SCLERODERMA).

This condition consists in a chronic thickening of the skin, which may affect one or more limbs or involve the whole integument. It is characterized by recurrent attacks of swelling of the skin and subcutaneous areolar tissue. After each attack the affected parts remain infiltrated to a larger extent than before, until finally the skin may attain a thickness of an inch, becoming wrinkled and fissured. In cattle this disease is confined to hot climates. The predisposing cause is unknown.

EDEMA (ANASARCA OF THE SKIN).

This is a dropsical condition of the skin and subcutaneous areolar tissue, characterized by pitting under pressure, the fingers leaving a dent which remains a short time.

_Causes._--Edema generally results from a weakened state of the system arising from previous disease. It may also be dependent upon a functional derangement of the kidneys, upon weak circulation, or obstruction to the flow of blood through the lungs. In debilitated animals and in some animals highly infested with parasites there is swelling of the dewlap or of the fold of the skin between the jaws.

_Symptoms._--Painless swelling of a limb, udder, lower surface of abdomen, or lower jaw becomes apparent. This may increase in dimensions for several days or may attain its maximum in less than 24 hours. Unless complicated with some acute disease of a specific character, there is not much, if any, constitutional disturbance. The deep layer of the skin is infiltrated with serum, which gives it the characteristic condition of pitting under pressure.

_Treatment._--When the cause can be ascertained and removed we may expect to see the edema disappear. When no direct specific cause can be discovered and the animal is debilitated, give general tonic. If, on the contrary, it is in good flesh, give a purgative, followed by half an ounce of acetate of potassium twice a day. External applications are useless.

Edema may be distinguished from erysipelas or anthrax by the absence of pain and fever.

DERMOID AND SEBACEOUS CYSTS (WENS).

A dermoid cyst is formed by an involution of the skin with a growth of hair on the inner wall of the sac. It may become embedded deeply in the subcutaneous tissues or may just penetrate the thickness of the skin, where it is movable and painless. They are generally found within the ear or at its base, although they may form on any part of the body. Usually they have a small opening, from which a thick, cheesy matter can be squeezed out. The rational treatment is to dissect them out.

Sebaceous cysts appear not unlike the former. They are formed by a dilatation of the hair follicle and sebaceous duct within the skin, and contain a gray or yellowish sebaceous mass. The tumor may attain the size of a cherry stone or a walnut. Generally they are round, movable, and painless, soft or doughy in consistency, and covered with skin and hair. They develop slowly. The best treatment is to dissect out the sac with contents entire.

VERRUCA (WARTS).

Cattle are affected with two varieties of warts. One, the verruca vulgaris, is composed of a cluster of enlarged papillÊ, covered with a thickened epidermis, the number of papillÊ determining the breadth and their length its height. They are generally circular in figure, slightly roughened on the surface, and spring from the skin by a broad base. Occasionally large numbers of very thin, long, pedunculated warts grow from the skin of the ear, lips, about the eyes, and vulva. Another variety, the verruca acuminata, sometimes erroneously denominated epithelial cancers, are irregularly shaped elevations, tufted or club shaped, occasionally existing as thick, short, fleshy excrescences, giving the growth the appearance of granulation tissue. Their color is red or purplish, and oftentimes by friction they become raw and bleeding, emitting then a very offensive odor. They usually grow in clusters and their development is rapid.

_Causes._--An abnormal nutrition of the skin, determined by increased energy of growth operating upon a healthy skin; at other times, upon a weak or impoverished skin.

_Treatment._--When they are small and pedunculated, they may be snipped off with shears and the stump touched with nitrate of silver. When they are broad and flattened, they may be dissected out and the wound cauterized if necessary. If they are large and very vascular, they may be ligated, one by one, by taking a strong cord and tying it as firmly around the base as possible. They will then shrivel, die, and drop off. If there is a tendency to grow again, apply a red-hot iron or nitric acid with a glass rod. Very often warts quickly disappear if they are kept soft by daily applications of sweet or olive oil.

KELIS.

Kelis is an irregularly shaped flat tumor of the skin, resulting from hypertrophy--increased growth of the fibrous tissue of the corium, producing absorption of the papillary layer.

_Causes._--It may arise spontaneously or follow a scar after an injury.

_Symptoms._--Kelis generally appears below the knee or hock, and may occur singly or in numbers. There are no constitutional symptoms. Its growth is very slow and seldom causes any inconvenience. It appears as a flattened, irregular, or spreading growth within the substance of the skin, is hard to the touch, and is especially characterized by divergent branches or roots, resembling the claws of a crab; hence the name. Occasionally some part of it may soften and result in an abscess. It may grow several inches in length and encircle the whole limb.

_Treatment._--So long as it causes the animal no inconvenience it is best not to meddle with it; when it does the animal ought to be fattened for beef, the meat being perfectly harmless to the consumer.

PARASITIC DISEASES OF THE SKIN.

RINGWORM (TINEA TONSURANS AND TINEA FAVOSA).

Ringworm is an affection of the skin, caused by a vegetable parasite.

The form known as tinea tonsurans is produced by the presence of a minute or microscopic fungus--the _Trichophyton tonsurans_, which affects the hair and the epidermic layer of the skin, and is highly contagious, being readily transmitted from one animal to another. This fungus consists of spores and filaments. The spores, being the most numerous, are round and seldom vary much in size. They are very abundant in the hair follicle. The filaments are articulated, waving, and contain granules. This disease is productive of changes in the root and shaft of the hair, rendering it brittle and easily broken off.

This disease becomes manifest by the formation of circular patches on the skin, which soon becomes denuded of hair. The cuticular layer of the skin in slightly inflamed, and vesication with exudation occurs, followed by the formation of scaly, brittle crusts. The patches appear silvery gray when incrusted, and are mostly confined to the head and neck. It is a common disease among young cattle in the winter and spring. Very early in the development of the patches the hairs split, twist, and break off close to the skin. This disease is attended with more or less itching. It is communicable to man.

Tinea favosa comes from another fungus, the _Achorion schˆnleinii._ This enters the hair follicle and involves the cuticle surrounding it, small crusts form which increase in diameter and thickness and then become elevated at their margin, forming a cup-shaped scab, the favus cup, which gives the disease its distinctive character. The number of these cups varies from a few to many hundreds. The hairs involved become brittle and broken, fall off with the crusts, leaving small bald patches. The crusts are of a pale or sulphur-yellow color at first; as they grow older they turn darker, or to a brown color. This form of ringworm has a peculiar odor, resembling that of mice or musty straw. It is occasionally communicated to cattle by man, mice, cats, etc., all being subject to it.

_Treatment._--Remove all crusts by washing with soap and water, then apply acetic acid, sulphur ointment, tincture of iodin or nitrate of mercury ointment once a day. Cleanse the stable and whitewash it to destroy the spores scattered by the crusts.

OTHER PARASITES AND PARASITIC DISEASES OF THE SKIN.

For discussion of mange, itch, scab, lousiness, warbles (grub in the skin), buffalo gnats, hornfly (_Hoematobia serrata_), ticks, flies, etc., see the chapter on "The animal parasites of cattle," page 502.

WOUNDS OF THE SKIN.

SNAKE BITES AND VENOMOUS STINGS.

[See discussion of these subjects in chapter on "Poisons and poisoning."]

BURNS AND SCALDS.

This is a rare accident among cattle, yet in cases of fire it may occur. The application of heat, whether dry or moist, unless sufficient instantly to destroy the life of a part, is always followed by the development of vesicles or blisters, which contain a thin, watery fluid. The blisters may be isolated and not very large, or one blister may cover a very large surface. When the burn is very severe the skin may be wholly devitalized, or the injury may extend into the deeper structures of the skin. Then sloughs will occur, followed by a contraction of the parts in healing; if on a limb, this may render the animal stiff. When the burn or scald has been a severe one, the resulting pain is great and the constitutional disturbance very marked.

_Treatment._--For a superficial burn use a mixture of equal parts of limewater and linseed oil, or common white paint--white lead ground in oil--to exclude the atmosphere and protect the inflamed skin. If it is not convenient to get anything else, chimney soot, flour, or starch may be spread on the wound (dry), and covered with cotton batting and light bandage. The blisters should be opened to let the contained fluid escape, but do not pull off the thin cuticle which has been raised by the blister. When the burn is extensive and deep sloughing occurs, the parts should be treated, like other deep wounds, by poulticing, astringent washes, etc. When the system has sustained much shock, the animal may require internal stimulants, such as 2 drams of carbonate of ammonia every hour until it rallies. When the pain is very great, hypodermic injections of 6 grains of morphia may be administered every six hours.

_Frostbite_ on any portion of the body may be treated as recommended in the article on diseases of the ears.

EMPHYSEMA (AIR OR GAS UNDER THE SKIN).

Emphysema of the skin is not a true disease of the skin, but it is mentioned as a pathological condition. It is characterized by a distention of the skin with air or gas contained in the subcutaneous areolar tissue. It may depend upon a septic condition of the blood, as in anthrax or blackleg, or air may be forced under the skin about the head, neck, and shoulders, as a result of rupture of the windpipe. It occurs in the region of the chest and shoulders from penetrating wounds of the chest and lung, and occasionally follows puncture of the rumen when the escaping gas is retained under the skin.

_Symptoms._--The skin is enormously distended over a greater or less portion of the body; thus any region of the body may lose its natural contour and appear like a monstrosity. There is a peculiar crackling beneath the skin when the hand is passed over it, and on tapping it with the fingers a resonant, drumlike sound is elicited.

_Treatment._--Puncture the distended skin with a clean, broad-bladed knife and press the air out. Further treatment must be directed with a view to the removal of the cause.

DISEASES OF THE FOOT.

By M. R. TRUMBOWER, D. V. S.

[Revised by Leonard Pearson, B. S., V. M. D.]

LAMINITIS (FOUNDER).

Laminitis denotes an active inflammation of the sensitive structures within the wall of the hoof, which in severe cases may result in suppuration and the loss of one or more claws. Owing to the simplicity of the structure of the foot of an ox compared with that of the horse, this disease is rarely seen in an acute form, but a mild form, commonly called "foot soreness," is not of infrequent occurrence.

_Causes._--Laminitis in cattle may be caused by overfeeding, overheating, continued standing without exercise on a stone or cement floor without sufficient bedding, or by driving long distances over rough or stony soil.

_Symptoms._--An unwillingness to maintain the standing position; the animal persists in lying down. The feet will be found unnaturally hot, and frequently some swelling may be noticed above the hoof. Pressure upon the hoof with blacksmith's hoof pincers causes pain and flinching. The general body temperature is increased and the breathing accelerated. Ordinarily the animal eats and drinks as usual. When it is made to move excessive tenderness of the feet becomes manifest, as is shown by reluctance to walk and by the very short, hesitating step. Founder affects the hind as well as the fore feet, although the front feet are more often exposed.

_Treatment._--Cold packs to the feet, or if the animal can be made to stand in a stream of water, having a soft bottom, the inflammation is often relieved without the necessity of any additional treatment. It may be well, however, to give a full dose of Epsom salt, 1 to 1-1/2 pounds, followed by half-ounce doses of saltpeter two or three times a day.

SORENESS (FOOT SORENESS).

Cattle that have been stabled or pastured on soft ground and are driven over stony roads soon wear down the soles of their feet and become lame from foot soreness. Draft oxen, for this reason, require to be shod. When the soreness is excessive it may develop into an active inflammation of all the sensitive structures of the foot--laminitis, or into a local bruise commonly called a "corn."

_Treatment._--Rest, poulticing the feet with moistened clay, followed by astringent washes--strong white-oak bark or alum water.

If the pain and heat last several days, it is probable that pus has formed beneath the wall of the hoof. In this case it is necessary to cut through the wall, usually at the most prominent part of the sole, to allow the accumulation to drain out. The animal should then stand for several hours daily in a tub containing a 3 per cent solution of some good milky coal-tar disinfectant. When not in the disinfecting solution the foot should be dressed with pine tar and cotton and bandaged with bagging.

LOSS OF HOOF.

Cattle sometimes become fastened between planks or otherwise and pull off the wall of one or both claws in the effort to extricate themselves. The claws of one or more feet may be shed as the result of acute laminitis.

_Treatment._--Wash the bleeding surface with an antiseptic and then with an astringent, such as a weak solution of alum, then apply a thick coating of pine tar; cover this with a layer of oakum or absorbent cotton; apply another coat of tar over this, and then bandage closely and firmly. This may remain without disturbance until the new growing wall becomes sufficiently strong to sustain the pressure and weight of the animal. If, however, at any time oozing or bad smell indicates that pus is forming under this dressing, the bandage should be removed and the suppurating surface freshly cleaned and dressed. This may have to be repeated every few days and should be continued so long as there is any pus formation. If the loss of hoof is owing to suppurative laminitis, the parts denuded of the horny covering must be thoroughly cleansed and disinfected with carbolic acid, lysol, or other antiseptic. Then apply a moderately thick layer of absorbent cotton and over this apply the tar and bandage. After this the antiseptic solution may be poured in daily at the top of the dressing. It will thus soak in and saturate the dressing and inflamed tissue. It may become necessary to remove all the dressing at daily or longer intervals to give the parts a fresh cleaning, and then to reapply it.

FOUL IN FOOT (FOOT ROT).

A variety of causes may produce inflammation of the foot between the claws or toes. It may be on account of overgrowth of the claws and inward pressure, as in ingrowing nail of man, or it may be caused by the irritation of stable filth by impaction and hardening of soil between the claws, or by other foreign substances becoming wedged in, causing inflammation and softening or ulceration of the skin in the interdigital space. Under some conditions several cattle in the same herd become affected, which has led some to think that the disease may be contagious. Occurrences have been reported in which foot rot of cattle has appeared within a short time among a large proportion of the cattle in a farming district. This disease is most frequently seen in the hind feet, though all four feet may become affected.

_Symptoms._--The animal is observed to limp. On examination of the foot we discover heat and swelling above the hoof and of the soft parts between the claws which frequently spreads the claws apart to a considerable extent, or the inflammation may have advanced to softening and sloughing of the interdigital membrane. If the disease is neglected at this stage, deep abscesses may form and the pus burrow under the horny wall, or the joint within the hoof may become inflamed and the articular attachments destroyed, in which case the treatment will be difficult and recovery will be very tedious.

_Treatment._--In the earlier stages of the disease, before pus burrows beneath the horn, a thorough cleansing and an application of a carbolic-acid solution--1 ounce to a pint of water--clean stabling, and laxative food will usually remedy the evil. Compound solution of cresol is an excellent remedy at this stage. It should be applied, in its pure or undiluted state, to the suppurating and putrefying tissue between the claws. It is best applied by means of a cotton swab on a thin stick. Care must be taken to keep it from contact with the skin about the coronary band or heels. If deep sloughing has taken place the carbolic solution should be used, and a wad of oakum or cotton smeared with pine tar should be secured firmly in the cleft. This can be done by taking a strip of strong cloth, 2 inches wide, passing the middle between the claws, then tying the ends after winding them in opposite directions above the hoof. Sometimes warm poulticing with flaxseed meal or bran is necessary to relieve excessive fever and pain. If the pus burrows under the horn, its channel must be followed by paring away the horn until the bottom is reached. The aftertreatment is the same as that already recommended. If the joint becomes diseased an amputation of that toe is the quickest and surest method to relieve the suffering of the animal, and offers the best chance for an early recovery.

ULCERATION OF THE HEEL.

Occasionally we find ulcers at the junction of the hair with the hoof at the heel, which present an elevated, raw, or ragged surface, and cause considerable lameness. This is generally caused by a bruise of the fibrous cushion of the back part of the foot. Subsequent sloughing or necrosis may occur, or pus may form deep within the wall and gain an exit at the margin of the heel. Sometimes, from no visible cause, large pieces of skin slough from the heel and pastern. This condition is caused by an infection with certain microorganisms (streptococci, necrosis bacilli) and may be contagious.

_Treatment._--If there is a deep opening, inject carbolic solution once a day until it closes. If the ulcer is only superficial, wash with carbolic solution and apply a mixture of equal parts of blue vitriol and alum in dry powder.

FISSURE OF THE WALL (SPLIT HOOF).

This is rarely seen among cattle. It may occur in weak walls, in heavily bodied cattle, caused by stepping on an uneven surface, especially when the point of the toe is grown out long. One may find the point of the toe broken and the wall split almost up to the hair.