When the ostrich has just hatched, there is a yolk sac in the abdominal cavity, which accounts for 25% to 30% of the body weight. A few days before hatching, the fledgling acquires nutrition from the yolk sac. As the yolk is absorbed, the yolk sac slowly shrinks and shrinks, and only the left is left. The next small yolk sac. However, in some cases, the absorption of the yolk was blocked or even completely stopped, resulting in weak, slow growth of the chicks and severe death. The author learned from the practice of brooding that 20% of the annual deaths due to the obstruction of yolk sac absorption account for 20% of the annual deaths. Etiology and prone groups The yolk sac is mainly caused by the infection of microorganisms, mainly affecting 10 to 18-day-old chicks. Clinical symptoms and diagnosis Obvious swelling of the abdomen is seen in the clinic, and there are obvious cysts on the touch. The bird has poor mental activity, reduced activity, loss of appetite, a chance to be alone, cold, and diarrhea. The main feature of the necropsy is that the yolk sac is larger than normal birds of the same age, the contents change from yellow-green viscous to yellow-brown, and there are even gray-black foul odors, from which E. coli, Proteus, Bacillus or intestinal can often be isolated. Coccus. Conservative treatment of antibacterial drugs has little effect. The author explored the practice through clinical practice and adopted yolk sac removal surgery. The effect is better. By carefully observing the touch of a 10-day to 18-day-old chick, timely and early detection was made to confirm the chicks whose yolk absorption was impeded. Prepare a sterilized scalpel, surgical scissors, forceps, gauze, iodine, needles, threads, fish ointment or anti-inflammatory powder. The assistant pressed the chicks on both legs with moderate pressure on the ventral part, grasped firmly and the abdomen faced upwards. The surgeon cleaned the abdomen of the chick with warm disinfectant, selected the middle of the straight line between the left leg and the rectum and wiped it with iodine. Cut off the part of the villi and then use the scalpel to select the place where the blood vessels are scarce and parallel to the abdominal midline. , Open the skin, open the peritoneum, knife 2 cm ~ 3 cm, you can see the yolk sac. At this point, the assistant should turn the chicks abdomen downwards and hold them at a 60-degree angle to the ground. The surgeon clamps the yolk sac with a hemostat and uses a knife to cut a small mouth (about 0.5 cm) at the tip of the clamp. At this point the contents will flow out, the surgeon applies forceps to fix the yolk sac and prevent the contents from flowing into the abdominal cavity. When there is at least volume flow, gently pull the hemostatic forceps and gently pull the yolk sac out little by little. When it is about to be finished, put the bird's abdomen upward to prevent the outflow of the intestinal tract, and then connect the yolk sac to the intestine. The blood vessel was cut off after the gut was ligated and the yolk sac was completely resected. Finally, the peritoneum was continuously sutured with a thread, the abdomen wall was sutured, and a fish-lipid ointment was applied. Precautions Early detection and diagnosis. The spirit of the young bird is not good, but it is not depressed; the appetite is decreased, but surgery is found when the baby is not in a hunger strike, which is good for postoperative recovery. The surgical environment should ensure high temperature of 30°C~32°C, ventilation and asepsis. Personnel and equipment are strictly disinfected. When cutting the peritoneum should be fast, accurate and stable, avoid underweight, even with the yolk sac cut. The yolk sac was clamped with a hemostat to allow the contents to flow out. Do not clip into the peritoneal cavity and cause peritonitis. Must be slow, a little bit of care to pull the yolk sac out of the abdominal cavity, avoid intestine gush. When vascularized the pedicles of the yolk sac, avoid inadvertently thinking of the small intestine as a blood vessel. It should be fastened with guts near the yolk sac. Smart thermometer,ear thermometer,best baby thermometer,forehead thermometer Shenzhen urion Technology Co., Ltd. , https://www.urionhealth.com