Common Diseases of Farm Animals Part 6

COMMON CAUSES OF LIVER DISORDERS.--Domestic animals commonly live under very unnatural conditions. Ill results do not follow unless these conditions are so extreme as to violate practically all of the health laws.

Pampered animals are especially p.r.o.ne to liver disorders. The feeding of too heavy and too concentrated a ration together with insufficient exercise is one of the most common causes of disorders of the liver. The feeding of a ration that is unsuitable for that particular species is a common source of disease in animals. For example, the feeding to carnivora of a ration made up largely of starchy feed, and the feeding of a ration containing an excessive quant.i.ty of protein to herbivorous animals may result in intestinal, liver and nervous disorders. Spoiled feed may prove highly injurious. Catarrhal inflammation of the intestine and intestinal parasites may obstruct the bile duct, and interfere seriously with the functions of the liver.

_Symptoms_.--In diseases of the liver the appet.i.te is irregular or the animal refuses to eat, is constipated, or has diarrhoea. The faeces may be grayish colored or foul smelling. Colicky pains are sometimes manifested.

Usually the animal acts dull and weak. A raise in body temperature may be noted. The visible mucous membranes may appear yellowish- or brownish-red in color.

_Treatment_.--Animals grazing over well drained pastures that are free from injurious weeds and provided with plenty of drinking water, seldom develop diseases of the liver. Exercise, a natural diet and plenty of clean water, as well as preventing liver disorders, may be cla.s.sed among the most important of all curative agents. Laxatives or cathartics, such as oils, salts, aloes, and calomel, in small doses may be given. We prefer the administration of oil or aloes to horses, Glauber's or Epsom salts to ruminants, and calomel to dogs. The administration of minimum doses of these drugs, and repeating the dose after a short interval, is preferable to large doses. Alkaline tonics are also indicated. The following mixture may be given: bicarbonate of soda, sulfate of soda and common salt, eight ounces of each, and powdered gentian and sulfate of iron, four ounces of each. Large animals may be given a small tablespoonful of this mixture with the feed three times a day. The dose for sheep and hogs is one teaspoonful.

A very light, easily digested ration should be fed.

QUESTIONS

1. What can be said of the importance of the liver?

2. Tell something of its duties as a gland.

3. In what animals are liver troubles most conspicuous when present?

4. Give causes of liver disorders.

5. What are the symptoms?

6. What are the most important natural cures?

7. What rule may be given for adapting suitable laxatives to different cla.s.ses of animals?

CHAPTER VI

DISEASES OF THE URINARY ORGANS

GENERAL DISCUSSION.--The urinary apparatus is composed of two glands, the kidneys and an excretory apparatus that carries the excretion of the kidneys to the outside.

The kidneys are situated in the superior region of the abdominal cavity (sublumbar) above the peritoneum, and to the right and left of the median line. They are highly vascular glands, somewhat bean-shaped and of a deep red color. These glands are capable of removing from the blood a fluid that is essentially different in composition and which, if retained in the blood, would be harmful or poisonous to the body tissues.

The kidney excretions are carried from the pelvis of the kidneys by the right and left ureters. These ca.n.a.ls terminate in the bladder, an oval-shaped reservoir for the urine. This organ is situated in the posterior portion of the abdominal cavity and at the entrance to the pelvic cavity. Posteriorly, it forms a constricted portion or neck. It is here that the urethra originates. This ca.n.a.l represents the last division of the excretory apparatus. In the female, the urethra is short and terminates in the v.u.l.v.a. In the male it is long and is supported by the p.e.n.i.s.

The urine secreted by the kidneys is a body excretion, and consists of water, organic matter and salts. The nitrogenous end-products, aromatic compounds, coloring matter, and mucin form the organic matter. The nitrogenous end-products and aromatic compounds are urea, uric and hippuric acids, benzoic acid and ethereal sulfates of phenol and cresol. The salts are sulfates, phosphates and chlorides of sodium, pota.s.sium, calcium and magnesium. The organic and inorganic matter varies with the ration.

The quant.i.ty of urine secreted within a given time varies in the different species and at different times in the same individual. In the horse the quant.i.ty secreted in twenty-four hours varies from twelve to fifteen pints; in cattle from ten to forty pints; in sheep from one-half to one and three-quarter pints. The normal color of the urine varies. In the horse it is yellow or yellowish-red; in cattle and sheep yellowish; and in the dog a straw yellow. The specific gravity varies with the quant.i.ty secreted and the ration fed. When the quant.i.ty of urine secreted is above the average, the specific gravity is usually low.

THE NECESSITY OF EXAMINING THE URINE.--In diseases of the urinary apparatus, a careful examination of the urine is very necessary in order to be able to form a correct diagnosis. In domestic animals it is impractical to attempt to determine the exact amount of urine pa.s.sed within a certain time, but we can make a general estimate of the quant.i.ty pa.s.sed by carefully observing the animal and noting the condition of the bedding in the stall. The sample of urine to be examined is best taken from urine collected at different periods during the day. We should note its color and consistency. The different substances in the urine can be determined only by determining the specific gravity, testing with certain chemical reagents and by making a microscopic examination of the sediment. Normal urine from the horse may be turbid or cloudy and more or less slimy, because of the presence of mucin. This is less true of other species. In disease the color of the urine may be changed to a pale yellow, red or brown. For example, in congestion of the kidneys the urine is light in color and rather transparent; in southern cattle fever it may be red; and in azoturia it may be brown.

EXCESSIVE URINATION.--The horse is the most common sufferer from excessive secretion of urine. The most common _causes_ are musty feeds, such as hay, grain and shipped feeds. New oats, succulent feeds and acrid plants may sometimes cause it. In the fall of the year, when the season is changing from warm to cool weather and the horse eliminates less water from the body by way of the skin, the kidneys may become more active and the quant.i.ty of urine secreted be greatly increased. This, however, is a normal physiological condition and should not be confused with this disease.

The first _symptom_ noted is the frequent pa.s.sing of a large quant.i.ty of urine. The animal drinks more water than usual and the appet.i.te is poor.

Dulness and a weak, emaciated condition are prominent symptoms. Death occurs unless the cause of the disease is removed. If the poisonous substance has been acting for some time, it is difficult to cure the animal.

This disease can be _prevented_ by eliminating spoiled feeds from the ration fed to animals in our care. Early in the attack the necessary attention to the ration and the feeding of a clean, nourishing ration is sufficient to correct the disease. The quant.i.ty of water drunk by the animal should be limited. Complete rest is indicated. Laxatives, stimulants and tonics should be given if necessary.

NEPHRITIS.--Congestion and inflammation of the kidneys commonly occur in mixed and specific infectious diseases, such as septicaemia, pyaemia and influenza. The toxic effect of spoiled feeds, impure drinking water, and irritating drugs like cantharides and turpentine may so irritate the kidneys as to cause them to become inflamed. Chilling of the skin and nervousness or extreme fear may sometimes cause a congestion of these organs. Inflammation of the kidneys is a common complication of azoturia.

Irritation from parasites should be included among the causes of this disease.

The _symptoms_ vary in the different stages of the disease. During the period of active congestion the quant.i.ty of urine secreted is increased.

The scant secretion of urine, dark in color and thick or turbid, is suggestive of an inflammation of the kidneys. The animal moves stiffly, the back may be arched, urination is painful and the urine is pa.s.sed in very small amounts. The appet.i.te is irregular or suppressed, the pulse strong at first but later small and weak, and the body temperature is elevated. On making a rectal examination we find the bladder empty and the kidneys enlarged and sensitive.

When the kidneys become so badly diseased that they can no longer perform their function of separating from the blood the nitrogenous end-products of digestion, uraemic poisoning occurs. In this later stage of the disease the animal staggers about if moved, and finally goes down in the stall and is unable to get up. Death is usually preceded by convulsions and coma.

_The prognosis_ is very unfavorable, death occurring in the majority of cases. In azoturia of horses and in infectious diseases, the inflammation is nearly always acute. The color of the urine, its high specific gravity and the small quant.i.ty pa.s.sed are valuable symptoms to consider in the recognition of this disease. Chronic inflammation generally develops slowly and may not give rise to any very prominent symptoms at first.

_The preventive treatment_ of nephritis consists in careful nursing of animals affected with acute infectious diseases, a clean water supply and avoiding the feeding of spoiled feeds. The _curative treatment_ is largely careful nursing. The animal should be given comfortable, well-ventilated quarters and complete rest. Chilling of the skin should be especially guarded against by protecting the body with heavy blankets and applying roller bandages to the limbs when necessary. The diet must be of such a nature as not to increase the work of the kidneys. For the first few days the animal should receive very little feed or water. Later a sloppy diet of sweet milk, green feed and mashes should be fed. Such purgatives as aloes and Glauber's salts are indicated at a very early stage in the disease. We must encourage the elimination of waste products by way of the skin in the larger animals by vigorous rubbing, blanketing and the administration of such drugs as pilocarpine. If the animal becomes weak, general and heart tonics may be given.

CYSt.i.tIS.--Inflammation of the bladder is not an uncommon disease of horses. It is commonly _caused_ by retention of the urine, calculi in the bladder and chilling of the body. Irritating drugs that are eliminated from the body in the urine, and infection of the bladder by germs may cause it.

_The symptoms_ are usually marked. The inflammation is characterized by more or less pain, depending on the degree of the inflammation, and frequent pa.s.sing of urine. Only a small amount of urine is pa.s.sed at each attempt, and in severe inflammation it may contain pus or blood. Colicky pains sometimes occur. The pain is usually manifested by a stiff, straddling gait and tenderness when pressure on the bladder is made by introducing the hand into the r.e.c.t.u.m or v.a.g.i.n.a, and pressing over the region of the bladder. General symptoms, such as elevation in body temperature and irregular appet.i.te, may be manifested.

_The treatment_ should be first directed at removing the cause. If a cystic calculus is present in the bladder it should be removed. If the retention of the urine is caused by some local condition, and this is very often the case in nervous, well-bred animals, this must first be corrected. It is best to feed green and soft feeds, such as bran mash and chopped hay, and, if the animal will take them, gruels. A physic of castor or linseed oil should be given occasionally. It is very necessary that the animal be kept quiet. Comfortable, clean quarters and a good bed should be provided.

Whenever necessary the animal should be blanketed. The medicinal treatment consists in irrigating the bladder with antiseptic solutions, and administering drugs that when eliminated by way of the urine may change its composition and render it less irritating. The following mixture may be given: pota.s.sium chlorate two ounces, salol one-half ounce, and powdered nux vomica one ounce. This mixture may be divided into sixteen powders. One of the powders should be given with each feed.

RETENTION OF THE URINE.--This may be due to a variety of _causes_. In the ox and ram, small calculi collect in the S-shaped curvature of the urethra, or at its terminal extremity. In the horse, cystic calculi are more common than urethral. In cattle and hogs, fatty secretions from the inflamed lining membrane of the sheath of the male may acc.u.mulate, and obstruct the flow of urine from the anterior opening. The giving of feed rich in salts, concentrated urine resulting from feeding of too dry a ration, insufficient exercise and inflammation of the bladder are the direct causes of calculi.

Compression of the urethra by growths or tumors, strictures of the urethra, distended bladder, spasm of the neck of the bladder in nervous animals, paralysis of the bladder and injuries to the p.e.n.i.s are common causes of retention of the urine.

_The early symptoms in ruminants_ are not usually recognized until a day or two after retention of the urine has occurred. The symptoms are then quite marked. The animal acts dull, refuses to eat, rumination is stopped, and there is a constant effort to urinate, as indicated by the raising of the tail and rhythmical contractions of the urinary muscles just below the a.n.u.s. Urine may dribble from the sheath or the flow may be completely suppressed. The odor of urine may be marked.

_Horses show symptoms_ of abdominal pain. The animal may move about the stall, lie down and get up again, or make unsuccessful attempts to urinate.

On examination the bladder is found to be greatly distended with urine. In the horse the retention is recognized at an earlier period than in ruminants, because of the prompt, decided symptom of pain.

Retention of the urine commonly terminates in rupture of the bladder in ruminants. When this occurs, the symptoms of pain are less evident. Death occurs from uraemic poisoning and peritonitis. The outcome is less favorable in ruminants than in solipeds.

_Inflammation of the sheath_ can be readily recognized because of the local swelling.

_The following lines of treatment_ are recommended: A ration or feed that favors the formation of calculi should not be fed to animals; inflammation of the sheath should receive prompt treatment--this consists in irrigating the part with warm, soapy or alkaline water, followed by an antiseptic wash; we may attempt to work the urethral calculi forward and out of the S-curve in the urethra; if this is unsuccessful, urethrotomy for their removal may be attempted.

The retention of the urine in horses, because of spasm or paralysis of certain muscles, may be treated by pa.s.sing the catheter. Sometimes spreading litter under the horse and keeping it quiet may induce it to urinate. Hot packs over the region of the back may be used. The treatment for calculi is entirely surgical. The operation for the removal of cystic calculi in the horse, although difficult, is followed by good results.

QUESTIONS

1. Describe the urinary apparatus.

2. Give the composition of the urine and quant.i.ty secreted in the different animals.

3. State method of determining quant.i.ty and composition of urine secreted by different domestic animals.

4. Give the causes and treatment of excessive urination.