LEAD POISONING.

Lead poisoning of cattle sometimes comes from their having licked freshly painted surfaces and thus swallowed compounds containing white lead. In several instances cattle have been poisoned by silage from a silo painted inside with lead paint shortly before filling. Sometimes cattle eat dried paint sc.r.a.pings with apparent relish and are poisoned. Cattle grazing on rifle ranges have been poisoned by lead from the bullets. Sugar of lead has been administered by mistake for Glauber's salt. Lead poisoning may be acute or chronic. The fatal dose of sugar of lead is from 1 to 4 ounces.

Water drawn from lead pipes or held in a lead-lined tank may cause poisoning.

_Symptoms._--The symptoms are generally dullness, lying down with the head turned toward the flank, colic, rumbling in the abdomen, loss of control of the limbs when walking, twitching, champing of the jaws, moving in a circle, convulsions, delirium, violent bellowing, followed by stupor and death. The symptoms generally extend over considerable time but may end in death after 24 hours.

_Chronic lead poisoning_ occasionally occurs in districts where lead mining is the princ.i.p.al industry. The waste products of the mine thrown into streams contaminate the water supply, so that the mineral is taken into the system gradually, and a very small per cent of any of the salts taken into the system in this way is pernicious. Water which contains any salt of lead to the extent of more than one-tenth of a grain to the gallon is unfit to drink. Such water when used continually is likely to produce colic from the resulting intestinal irritation, and in aggravated cases paralysis more or less severe is likely to be developed. A blue line on the margin of the gums, the last symptom, is regarded as diagnostic and its presence as conclusive evidence of the nature of the disorder.

_Treatment._--The treatment should first be directed toward removing the cause. A large dose of purgative medicine should be given, and the brain symptoms be relieved by giving bromid of pota.s.sium in half-ounce doses every 4 or 5 hours and by the application of cold water to the head. Dilute sulphuric acid in half-ounce doses should be given with the purgative medicine. In this case sulphate of magnesia (Epsom salt) is the best purgative, and it may be given in doses of from 1 to 2 pounds dissolved in warm water. After the acute symptoms have abated, iodid of pota.s.sium may be given, in doses of 2 drams each, three times a day for a week.

No treatment is likely to be of avail until the cause is removed.

COPPER POISONING.

The soluble salts of copper, though used as a tonic in the medicinal treatment of cattle, are poisonous when taken in large quant.i.ties. Like lead and a.r.s.enic, they have an irritant effect upon the mucous membrane with which they come in contact in a concentrated form. Cattle are not very likely to be poisoned from this cause unless through carelessness. Sulphate of copper, commonly called blue vitriol, is occasionally used for disinfecting and cleansing stables, where it might inadvertently be mixed with the feed. It is also used largely for making the Bordeaux mixture used in spraying fruit trees. The general symptoms produced are those of intestinal irritation, short breathing, stamping, and tender abdomen.

_Treatment._--Give powdered iron, or iron reduced by hydrogen, or calcined magnesia. Sulphur may be used. This should be followed by a liberal supply of demulcents, linseed infusion, boiled starch, whites of eggs, etc.

ZINC POISONING.

Several of the soluble salts of zinc are irritant poisons. The chlorid and sulphate are those in most common use. In animals which have power to vomit they are emetic in their action. In others, when retained in the stomach, they set up more or less irritation of the mucous membrane and abdominal pain, producing symptoms already described in the action of other poisons which produce the same result.

_Treatment._--The treatment should be the same as for copper poisoning.

PHOSPHORUS POISONING.

Only one of the forms of phosphorus in common use--the ordinary yellow--is poisonous. Phosphorus in this form is used for the destruction of rats and mice and other vermin, and has been largely used in the manufacture of matches.

_Symptoms._--The symptoms are loss of appet.i.te, colic, diarrhea, irritation of the mouth and throat, and paralysis of the throat. There is also weakness, difficult breathing, and rapid pulse. The course of the poisoning is usually rapid, terminating in either recovery or death within three days. The toxic dose for cattle is from 5 to 30 grains. If taken in large quant.i.ties the excreta are occasionally noticed to be luminous when examined in the dark.

_Treatment._--Turpentine is given in an emulsion with flaxseed tea in a single dose of from 2 to 8 ounces. Permanganate of pota.s.sium may be given in a one-fourth of 1 per cent solution. Stimulants, such as alcohol and ether, should be administered. Oils and milk must not be given.

MERCURY POISONING.

Mercury poisoning is not rare in cattle from the fact that these animals have a special susceptibility to the action of this substance. Antiseptic washes or injections containing the bichlorid of mercury (corrosive sublimate) must be used on cattle with great care. Mercurial disinfecting solutions or salves must be used cautiously. Calomel can not be given freely to cattle.

_Symptoms._--The symptoms are salivation, sore mouth, indigestion, diarrhea, skin eruption, paralysis of local groups of muscles, and nephritis.

_Treatment._--The treatment consists in administering sulphur in large doses (2 to 4 ounces) or iron powder. Both make insoluble compounds with mercury. Follow with the whites of eggs mixed with water and with linseed tea. If the case does not terminate promptly, give iodid of potash in 1-dram doses twice daily.

POISONING BY ACIDS.

MINERAL ACIDS.--The mineral acids--nitric, sulphuric, hydrochloric, etc.-- when used in a concentrated form destroy the animal tissues with which they come in contact, and in this respect differ from most of the poisons previously described. When taken into the stomach the mucous membrane of the mouth, pharynx, esophagus, and stomach is apt to be more or less completely destroyed. If taken in large quant.i.ties death is likely to result so speedily that nothing can be done to relieve the patient, and even if time is allowed and the action of the acid can be arrested it can not be done until considerable and, perhaps, irreparable damage has been done. The mucous membrane with which the acid has come in contact in the esophagus may be destroyed by its corrosive action and carried away, leaving the muscular tissues exposed. The raw surface heals irregularly, the cicatrice contracting causes stricture, and an animal so injured is likely to die of starvation. In the stomach even greater damage is likely to be done. The peristaltic action of the esophagus carries the irritant along quickly, but here it remains quiet in contact with one surface, destroying it. It is likely to perforate the organ and, coming in contact with the abdominal lining or other organs of digestion, soon sets up a condition that is beyond repair. In a less concentrated form, when this is not sufficiently strong to be corrosive, it exerts an irritant effect. In this form it may not do much harm unless taken in considerable quant.i.ty.

When thus the mucous membrane of the stomach and intestines becomes inflamed pain and diarrhea are likely to result.

_Treatment._--Any of the alkalies may be used as an antidote. Most convenient of these are chalk, baking soda, marble dust, magnesia, lime, soap, or plaster from a wall. Mucilaginous drinks should be given in large quant.i.ties.

VEGETABLE ACIDS.--Oxalic acid in particular is corrosive in its action when taken in concentrated solution, losing its corrosive effect and becoming irritant when more dilute. It also exerts a specific effect on the heart, frequently causing death from syncope. Taken in the form either of the crystals or solution it is likely to cause death in a very short time.

Failure of heart action and the attendant small pulse, weakness, staggering, and convulsions are the more noticeable symptoms. Acetic acid is irritant to the gastrointestinal tract, and may cause sudden paralysis of the heart.

_Treatment._--The action of the acid should be counteracted by the use of alkalies, as advised above, by limewater or lime or plaster given promptly, by protectives to the digestive tract, and by stimulants.

POISONING BY ALKALIES.

The carbonates of potash and soda and the alkalies themselves in concentrated form cause symptoms of intestinal irritation similar to those produced by mineral acids. Ammonia, caustic soda, and caustic potash (lye) are those to which animals are most exposed. The degree of their caustic irritant effects depends on their degree of concentration. When they reach the stomach the symptoms are nearly as well marked as in the case of the acids. The irritation is even more noticeable, and purgation is likely to be a more prominent symptom. If death is not caused soon, the irritation of the gastrointestinal tract and malnutrition will last for a long time.

_Treatment._--Treatment consists in neutralizing the alkali by an acid, such as dilute sulphuric acid (1 per cent) or strong vinegar. The administration of such an antidote and its action must be carefully watched during administration. In the chemical change which takes place when the acid and alkali are combined, carbonic-acid gas is liberated, which may be to an extent sufficient to cause considerable distention of the abdomen, and even to produce asphyxia from pressure forward on the diaphragm. Should this danger present itself, it may be averted by opening the flank, permitting the gas to escape. (See "Acute tympanites, or Bloating," p. 22.) Flaxseed or slippery-elm decoction must be given to sooth the inflamed mucous surface. Opium may be used to allay pain.

COAL-OIL POISONING.

Coal oil is sometimes administered empirically as a treatment for intestinal parasites. If given in large doses it produces poisonous effects, which are likely to be manifested some time after the administration. It acts as an irritant to the digestive tract, causing dribbling of ropy saliva from the mouth, diarrhea, tenesmus, and loss of appet.i.te, with increased temperature and cold extremities. Visible mucous membranes are injected, pupils of the eyes are contracted, and there is a watery discharge from the eyes and nostrils. Remotely it exerts a depressing influence on the functions of the brain and slight coma, and occasionally convulsions, from which the animal is easily aroused. The kidneys also suffer. The urine is dark colored and has the characteristic odor of coal oil. Death may result from gastroenteritis or convulsions.

_Treatment._--The patient's strength should be fostered by the frequent administration of mild stimulants, of which aromatic spirits of ammonia is perhaps the best. The animal should be encouraged to eat soft feed and given mucilaginous drinks.

Crude coal oil is sometimes applied to the skin to kill parasites. If too much is used, especially in hot weather, great weakness and depression may be caused and in some cases death may result.

CARBOLIC-ACID POISONING.

Although one of the most valuable antiseptic remedies, carbolic acid in a concentrated form, when taken internally or used over a large surface externally, is likely to produce poisonous effects. It causes whitening, shrinking, and numbness of the structures with which it comes in contact, and, besides its irritant effect, exerts a powerful influence on the nervous system. Being readily absorbed, it produces its effect whether swallowed, injected into the r.e.c.t.u.m, inhaled, or applied to wounds, or even to a large tract of unbroken skin. Used extensively as a dressing, it may produce nausea, dizziness, and smoky or blackish colored urine. The last symptom is nearly always noticeable where the poisonous effect is produced.

In more concentrated form, or used in larger quant.i.ties, convulsions, followed by fatal coma, are likely to take place. Even in smaller quant.i.ties, dullness, trembling, and disinclination for food often continue for several days. In a tolerably concentrated solution it coagulates alb.u.men and acts as an astringent.

_Treatment._--As an antidote internally, a solution of sulphate of soda or sulphate of magnesia (Glauber's or Epsom salt) may be given. The white of egg is also useful. Stimulants may be given if needed. When the poisoning occurs through too extensive applications to wounds or the skin, as in treatment of mange, cold water should be freely applied so as to wash off any of the acid that may still remain unabsorbed. As a surgical dressing a 3 per cent solution is strong enough for ordinary purposes. Water will not hold more than 5 per cent in permanent solution. No preparation stronger than the saturated solution should be used medicinally under any circ.u.mstances.

SALTPETER POISONING.

Both nitrate of soda and nitrate of pota.s.sium are poisonous to cattle.

These substances are used for manure and for preserving meats. They may be administered in a drench by error in place of Glauber's salt, or they may be exposed within reach of cattle and thus be eaten. The toxic dose depends upon the condition of fullness of the stomach. If in solution and given on an empty stomach, as little as 3 ounces of saltpeter (nitrate of pota.s.sium) may be fatal to a cow. More of the Chile saltpeter (nitrate of soda) is required to cause serious trouble.

_Symptoms._--Severe gastroenteritis, colic, tympanites, diarrhea, excessive urination, weakness, trembling, convulsions, collapse.

_Treatment._--Same as for poisoning by common salt.

POISONING BY COMMON SALT.

A few pounds (3 to 5) of common salt will produce well-marked signs of poisoning in cattle. So much salt as this will not be taken by cattle except under unusual conditions. If the feed is poor in salt, and if no salt has been given for a long time, an intense "salt hunger" may occur that may lead an animal to eat a poisonous quant.i.ty, or an overdose of salt may be given by error as a drench. In order to prevent overeating of salt, it is doubtless better in salting cattle to use rock salt rather than that in more or less finely divided form.

Herring and mackerel brine and pork pickle are also poisonous, and are especially dangerous for hogs. In these substances there are, in addition to salt, certain products extracted from the fish or meat which undergo change and add to the toxicity of the solution. Sometimes saltpeter is present in such brines.

_Symptoms._--The symptoms are great thirst, abdominal pain, diarrhea, poor appet.i.te, redness and dryness of the mouth, increased urination, paralysis of the hind legs, weak pulse, general paralysis, coma, and death in from six to eight hours.