Prenatal condition: The cow is 3.5 years old and is a first-time cow with good nutritional status. The abdominal circumference is significantly enlarged before delivery, and the mammary glands are well developed with milk secretion. In the early stages, there were symptoms of restlessness, restlessness, and increased frequency and strength of restlessness, with a small amount of amniotic fluid flowing out. Later, the owner found that the frequency of restlessness decreased and the lips of the calf came out first. Oxytocin has been used, but it still cannot produce. Before processing, use bovine ultrasound to diagnose it.

The function of BCF imported cattle assisted delivery with B-ultrasound is to first perform vaginal examination, or Boxiang imported cattle assisted delivery with B-ultrasound for rectal examination, using push and pull methods. However, this may not be successful, as the calf's tongue can be felt with a little finger and there is a sensation of movement. The calf also has vital signs. If assisted delivery fails, a cesarean section surgery is performed.

The assistance of B-ultrasound in the surgical process for imported cattle: 1. Preparation for surgery: First, the left side of the cow is placed upside down and the incision area on the right thigh is slightly shaved. Rinse with clean water as much as possible, wrap the area outside the surgery with sterile white cloth, and disinfect the shaved area with iodine. 2. The surgery is performed at the incision site (continuous between the bone width nodule and the navel), and 0.5% procaine 50ml point is used for infiltration anesthesia. After about 5 minutes, a incision of about 30 centimeters is made, the skin is cut open, and the femoral layers are bluntly separated with a surgical handle to fully stop bleeding. The peritoneum is cut open, and the peritoneum is pulled out of the incision and fixed. The abdominal cavity is examined, and the calf's foot inside the uterine horn is grasped by hand. It is pulled out as much as possible along the large curvature of the uterine horn to the outside of the abdominal wall incision. A longitudinal incision of about 30 centimeters is made at the right uterine horn, avoiding the cotyledons, and the fetus is pulled out for assistant treatment. Then peel off the placenta, complete the removal, dip the uterine slurry dry with sterile gauze, fill it with 800000 * 10 bottles of penicillin, and continuously suture the uterine serosa and muscle layer with intestinal thread. Then use the inversion suture method to suture the second layer. After suturing, rinse the surface of the uterine horn with physiological saline and dry it, apply penicillin ointment, and send the uterus back to the abdominal cavity. Then use nodule suturing method to suture the peritoneum and various muscle layers, use tension reducing suturing method to suture the skin, and apply penicillin and fish fat ointment to the incision.