The operation upon the female may be performed on account of diseased conditions, but we may say that the chief object of the operation is to make the animal one of more profit to its owner by lessening the lacteal secretion and also improving the physical condition from the point of view of beef production. When the cow is spayed, it does away with all trouble attending estrum, or heat, gestation, and parturition with its accidents and ailments. The flesh of the spayed cow is more tender and juicy than that of the natural animal.
The operation upon the male may be either the uncovered or the covered. In the former the incision is made down to the testicle proper, and in the latter the cut is made through the scrotum or the outside covering and through the dartos, or the next coat, care being taken to cut no deeper tissues or coats. The age at which the operation is performed varies, but usually it is performed between the second and third month. If done in early life, there is less danger of complications, the organs being in a latent condition and not fully developed. There are many different methods of operating, the principal ones of which we shall mention. In the uncovered operation a good free incision should be made, exposing the testicle completely. Now it may be removed by simply cutting it off. The only danger of doing this is that hemorrhage is liable to follow. To obviate this, before the division of the spermatic cord it should be twisted several times in the following manner: Take hold of the cord with the left hand, having it between the thumb and the index finger. Now twist the free portion several times with the right hand, all the time being careful to push with the left hand toward the body of the animal. In this way the danger of injury to the cord during the animal's struggles will be overcome. There will be no hemorrhage, or very little, if it has been done properly. This is the most simple manner of torsion. There are forceps and other instruments made to perform the operation in this manner. The actual cautery is an old method, but we shall not describe it, as we consider that we have better methods now. The next method with the clamps, although extensively used upon the horse, is not practiced to so great an extent upon the bovine at the present time. It is a very old method, and is considered very safe. Clamps are used in the covered and uncovered operations.
More modern methods are by the use of special instruments known as the emasculator and the écraseur.
The operation of "mulling" or crushing the spermatic cord is an unscientific and barbarous procedure, causing unnecessary pain and suffering.
The methods described above apply only to the animal in a normal condition. Before operating everything should be examined to see that it is as it should be. If otherwise, a special operative procedure will be necessary. Whichever mode of operation is adopted from a practical standpoint, the principal precautions to be taken in order to attain success are as follows: First, thorough cleanliness under strict aseptic and antiseptic precautions; second, a free and boldly made incision; third, the avoidance of undue pulling or tension upon the spermatic cord; fourth, free drainage, which can be maintained, provided the original incision has been properly made.
The operation of castration of the male is by no means a serious one, and when properly performed there is little danger from complications. Although the danger is trifling, the complications which may arise are sometimes of a serious nature. Hemorrhage, either primary or secondary, tetanus (or lockjaw), abscesses, hernia (or rupture), gangrene, and peritonitis are the most serious complications that follow castration. Whichever complication arises will require its own special treatment, which we will not go into here, as it will be fully dealt with under another heading. We would add, however, that, generally speaking, the animal, after being castrated, should either be regularly exercised or be allowed freedom so that it can exercise itself. Sudden changes of the temperature are dangerous. The animal should be fed moderately, but of a diet easily digestible.
CASTRATION OF THE FEMALE.
The operation of ovariotomy (spaying) should be performed when the heifer is in her prime and in moderate condition not too plethoric and not in heat or pregnant. This operation may be performed in one of two ways—namely, by the flank or by the vagina—each operation having its special advantages. In the flank operation the animal may be operated upon either while standing or while in the recumbent position. If standing, she should be placed against a wall or a partition and her head held by a strong assistant. The legs also must be secured to prevent the animal from kicking. A vertical incision should be made in the left flank, about the middle of the upper portion, care being taken not to make the opening too far down, in order to avoid the division of the circumflex artery which traverses that region. The operator should now make an opening through the peritoneum, which is best done with the fingers. Next the hand and arm should be introduced into the abdominal cavity and the hand directed backward toward the pelvis, searching for the horns of the uterus; if followed up the ovaries will easily be found. They should then be drawn outward and may be removed either by the écraseur or by torsion. Closing and suturing the wound will complete the operation. An adhesive plaster bandage can be beneficially applied.
The operation by the vagina is more complicated and requires special and expensive instruments. The mode of procedure in brief is as follows: A speculum is introduced into the vagina, and an incision is made into the superior wall of that passage about 2 inches from the neck of the uterus, cutting from below upward and from before backward. An incision which should not exceed 3½ inches in length should be made. The next step is to get possession of the ovaries. They are situated in a fold of the broad ligament and should be drawn carefully through the incision into the vagina. Now take the long-handled scissors, specially made for this purpose, with which the thick border of the broad ligament is divided. The torsion forceps are introduced and applied to the broad ligament above the ovary. The left hand is then introduced, and the thumb and the index finger grasp hold of the broad ligament above the forceps. With the right hand torsion is applied and the ovary removed. The other ovary may be removed in the same manner.
What has been said with regard to complications and aftertreatment in the case of the male also applies to the female.