To prevent the animal from striking out with the front legs, a rope is passed above and around the knees in the form of the figure 8; the animal is backed into a corner, and operation is then quite safe.
Large animals must be cast or placed in the trevis.
The seat of operation should be washed, shaved, and disinfected.
The operation may be divided into four stages.
First stage. Vertical median incision about 2 inches long through the skin at the height of the upper third of the trachea.
Second stage. Separation with a blunt director of the muscles covering the trachea. Incision through the pretracheal connective tissue.
Third stage. Circular or elliptical opening through the trachea of a size corresponding to that of the tracheotomy tube.
Fourth stage. Insertion of the tracheotomy tube.
CHAPTER VI.
GENITO-URINARY ORGANS.
In the domestic ruminants the penis exhibits a peculiar S-shaped curve, situated in the subpubic region (Fig. 226), so that when operation on the urethra, or even on the extremity of the penis, becomes necessary the organ must first of all be withdrawn.