For some years we have used a little instrument, which can be made by any worker in metal, consisting of a steel point riveted into a short cannula made to fit on one end of the ring while open. ([Pl. XXVII], fig. 11.) When attached to the ring it is easily and quickly passed through the septum, the half of the ring following as a matter of course. It can then be removed and the ends of the ring brought together and fastened by means of the screw for that purpose.
DEHORNING.
In the wild state the utility of the horns of cattle as weapons of offense and defense is apparent, but with domestication of cattle and their confinement the presence of horns constitutes a menace to the safety of their companions. Horned cattle frequently inflict with their horns painful and serious injuries to others. Deaths as a result of such injuries are not unusual. The operation of dehorning would therefore be indicated as a matter of general safety.
On farms where breeding is conducted, the most desirable method is to prevent the horns from growing on the young calves. This action results in a more symmetrical appearance of the poll and eliminates the dangers which would result from the presence of horns on the young cattle prior to their operative removal at a later age. A calf should be treated not later than one week after it is born—preferably when it is from 3 to 5 days old. The agent to be used may be either caustic soda or potash in the form of sticks about the thickness of an ordinary lead pencil. These caustics must be handled with care, as they dissolve the cuticle and may make the hands or fingers sore. The preparation of the calf first consists in clipping the hair from the parts, washing clean with soap or warm water, and thoroughly drying with a cloth or towel. The stick of caustic should be wrapped in a piece of paper to protect the hands and fingers, leaving one end of the stick uncovered. Moisten the uncovered end slightly and rub it on the horn buttons or little points which may be felt on the calf's head—first on one, then on the other—two or three times, allowing the caustic to dry after each application. Be careful to apply the caustic to the horn button only, for if it is brought in contact with the surrounding skin it will cause pain. Too much moisture on the stick of caustic will allow the application to spread to the surrounding skin. After treatment keep the calf protected from rain, as water on the head after application of the caustic will cause it to run down over the face.
Dehorning of adult animals is usually performed after the age of 2 years, as after that age there is less probability of the horns again growing. The horns should be severed from the head from a quarter to a half-inch below where the skin joins the base of the horn, cutting from the back toward the front if a saw is used. If the horn is not cut close enough to the head, an irregular, gnarly growth of horn is liable to follow.
Before attempting to dehorn the animal, it should be securely controlled by ropes in a stanchion or by casting. Upon the range the cattle are usually controlled by casting or by placing them in a "squeezer" connected with a corral. A clean, sharp meat saw or a miter saw with a rigid back may be used. Various types of dehorning shears or clippers are in general use. One type of dehorner has a stationary knife edge with its cutting edge shaped like a very wide V, and opposing this, another knife of similar shape moving in a slide, so that the cutting edges act upon the horn from all four sides at once, all the edges passing the center at the same time. Another type has a movable knife, with one oblique or one curved edge, and the cutting is done in one direction only. The power for cutting with these instruments is supplied by pulling together two long handles which, in order to transmit a greater force, are generally so constructed that they act through the medium of a series of cogs. In dehorning with these instruments the cutting edges should be slipped down over the horn and the knives closed, so that their edges set firmly against the horn in such position that the cut will be made in the right place and in the right direction. The handles should then be drawn together with a quick, firm, strong pull so that the horn will be completely severed by the first act and without twisting.
Dehorning should, when possible, be performed in cool weather when the flies are not plentiful. The loss of blood from the operation is not sufficient, as a rule, to be of consequence, and after care being taken to prevent substances from getting into the openings left after the removal of the horns it is not usual to apply any dressing. Pine tar or a mixture of pine tar and tannic acid may be applied, particularly if the weather is warm.
SETONING.
The ordinary use of a seton is to keep up constant drainage from a cavity containing matter or to act as a stimulant or counterirritant. To insert a seton, the place of entrance and exit having been decided on, with the finger and thumb make a small fold of the skin transversely to the direction the seton is to be inserted, and cut it through, either with a sharp knife or a pair of scissors (this should be done at both the entrance and exit); then with a steady pressure and slight lateral movement insert the seton by means of a seton needle. ([Pl. XXVII], figs. 1 and 2.) The seton should consist of a piece of strong tape, varying in breadth according to circumstances, and should be kept in place either by a knot on each end or by tying the ends together.