1. Tilted foot type: commonly known as castration soft chamber, the operator steps on the sow's neck with his right foot, leans his left foot on the recommended spine or tail root, and fixes the left hind leg of the piglet with his left wrist, so that the hind leg of the piglet is tilted up from the ground. The operator fixes the surgical site with the thumb of his left hand, cuts the abdominal wall muscle with a knife with his left hand, passes the hook end through the peritoneum with a knife, and gently exerts force around the wound with the fingers of his right hand, so that the uterine horns and ovaries on both sides are exposed as much as possible, which is convenient.

2. Improved formula: the operator holds the calf of the sow's left hind leg with his left hand, the shoulder of the piglet's left front leg with his right hand, gently puts it on the ground, steps his right foot on the piglet's right ear, steps his left middle finger on the toe of the piglet's left hind leg, and presses his thumb on the same side, counting backwards from the second pair of nipples for about 2-3cm, which is the operating part. The right hand used a knife to cut the abdominal wall muscle and peritoneum at one time along the edge of the left thumb, and the length of the incision was about 65438. The thumb of the left hand is close to the operation department, and the scalpel is gently expanded outward to make the wound square. The size of the wound depends on the size of the pig. With the size of abdominal pressure, the uterus will gradually emerge, and the left finger will fix the uterine horn that has emerged. The thumb and forefinger of the right hand will hold the clothes (the cornea of the uterus), and the fingers will hold around the wound with a little force to quickly remove all exposed uterine horns and ovaries.

3. Traditional method: The traditional method is basically the same as the foot lifting method, but the difference is that the left foot steps on the toes of the sow's hind legs instead of resting on the recommended spine or stepping on the tail root.

4, hob fancy: its operation method is the same as the "improvement", the difference is that the surgeon is fast and powerful when entering the knife, and the left thumb is straight and powerful, so that the uterus and ovaries suddenly emerge from the abdomen, and then removed.

5. Boar castration: the operator steps on the pig's neck with his left foot and the tail root with his right foot. His left thumb, middle finger and forefinger hold the neck of the pig's scrotum, push the testicles to the bottom of the scrotum, and tighten the scrotum. His right hand holds a knife, and his right thumb and forefinger hold the tip of the knife. The thumb and forefinger are exposed from the tip of the knife by about 65,438+0-2 cm, and cut down 2-2 cm along the scrotal space.