Treatment.—If the case is not extreme, it may be sufficient to drive the animal at a walk for a quarter or half an hour; or cold water by the bucketful may be thrown against the cow's sides. In some cases the following simple treatment is successful: A rope or a twisted straw band is coated with pine tar, wagon grease, or other unsavory substance and is placed in the cow's mouth as a bit, being secured by tying behind the horns. The efforts of the animal to dislodge this object result in movements of the tongue, jaws, and throat that stimulate the secretion of saliva and swallowing, thus opening the esophagus, which permits the exit of gas and at the same time peristalsis is stimulated reflexly.
In urgent cases the gas must be allowed to escape without delay, and this is best accomplished by the use of the trocar. The trocar is a sharp-pointed instrument incased in a cannula or sheath, which leaves the sharp point of the trocar free. (See [Pl. III], figs. 5a and 5b.) In selecting the point for using the trocar a spot on the left side equally distant from the last rib, the hip bone, and the transverse processes of the lumbar vertebræ must be chosen. Here an incision about three-fourths of an inch long should be made with a knife through the skin, and then the sharp point of the trocar, being directed downward, inward, and slightly forward, is thrust into the paunch. ([Pl. I].) The cannula or sheath of the trocar should be left in the paunch so long as any gas continues to issue from it. If the cannula is removed while gas is still forming in the paunch and the left flank becomes considerably swollen, it may be necessary to insert it again. It is well, accordingly, to observe the cannula closely, and if gas is found to be issuing from it it should not be removed. When gas issues from it in c onsiderable quantities the sound accompanying its escape renders the exact condition obvious. It is occasionally necessary to keep the cannula in the stomach for several hours. When this is necessary a piece of stout cord should be passed round the neck of the cannula immediately below the projecting rim and then be passed round the animal's body and tied in a secure knot, and a careful attendant must remain with the cow during the entire period that the instrument is in place. The rim surrounding the mouth of the cannula should be in contact with the skin. Whenever the person in charge of the cow is convinced that gas has ceased to issue from the cannula the instrument should be removed.
The trocar is to be used only in extreme or urgent cases, though everyone who has had experience in treating indigestion in cattle realizes that he has saved the lives of many animals by its prompt application.
When the tympanitic animal is not distressed and the swelling of the flank is not great, or when the most distressing condition has been removed by the use of the trocar, it is best to use internal medicine. Two ounces of aromatic spirits of ammonia should be given every half hour in a quart of cold water; or half an ounce of chlorid of lime may be dissolved in a pint of tepid water and the dose repeated every half hour until the bloating has subsided; or 1 ounce of creolin in 2 quarts of tepid water may be given at one dose or carefully injected through the cannula directly into the paunch to stop fermentation and the consequent formation of gas. It is generally necessary to give a moderate dose of purgative medicine after bloating has subsided, as animals frequently show symptoms of constipation after attacks of indigestion. For this purpose 1 pound of Glauber's salt may be used.
The animal should be fed carefully upon easily digested food for several days after the bloating has subsided, so that all fermenting matter may pass out of the stomach.
CHRONIC TYMPANITES.
Cattle, especially those that have been kept in the stable all winter, are liable to suffer from chronic tympanites. In this form they bloat up after feeding, but seldom swell so much as to cause any alarm. The chronic form of indigestion may also follow an acute attack like that previously described. This is also a symptom of tuberculosis when the lymphatic glands lying between the lungs are so enlarged as to press upon and partly occlude the esophagus. It may develop in calves as a result of the formation of hair balls in the stomach.
Treatment.—Treatment should be preceded by a moderate dose of purgative medicine: 1 pound of sulphate of magnesia (Epsom salt) or sulphate of soda (Glauber's salt), half an ounce of powdered Barbados aloes, 1 ounce of powdered ginger, 1 pint of molasses. The salts and aloes should be dissolved by stirring for a few minutes in 2 quarts of lukewarm water, then the molasses should be added, and after all the ingredients have been stirred together for about 10 minutes the dose should be administered. After the operation of the purgative it is generally necessary to give some tonic and antacid preparation to promote digestion, which is imperfectly performed in such cases. The following may be used: Powdered gentian, 3 ounces; powdered bicarbonate of potash, 3 ounces; powdered ginger, 3 ounces; powdered capsicum, 1 ounce. Mix and divide into 12 powders, one of which should be given three times a day before feeding, shaken up with a pint and a half of water. It is also advantageous in such cases to give two heaped teaspoonsfuls of wood charcoal, mixed with the animal's feed three times a day. The animal should also go out during the day, as want of exercise favors the continuance of this form of indigestion. If the dung is hard, the constipation should be overcome by feeding a little flaxseed twice daily or by giving a handful of Glauber's salt in the feed once or twice daily, as may be necessary. Roots, silage, and other succulent feeds are useful in this connection. If tuberculosis is suspected as the cause of chronic bloating, a skilled veterinarian should make a diagnosis, using the tuberculin test if necessary. Until it is settled that the cow has not tuberculosis, she should be kept apart from the other members of the herd.
DISTENTION OF RUMEN OR PAUNCH WITH FEED.
This form of indigestion is caused by the animal gorging itself with feed, and arises more from the animal's voracious appetite than from any defect in the quality of the feed supplied to it. The condition is, however, more severe if the feed consumed is especially concentrated or difficult of digestion. In cases of this kind there is comparatively no great formation of gas, and the gas which is formed is diffused through the stomach instead of accumulating in a layer in its upper part. On pressing the flank with the closed fist the indent of the hand remains for a short time in the flank, as if the rumen were filled with a soft, doughy mass.