I. Induction of labor
If the sow has passed the expected date of birth (114 days) for 1 day, there will be no birthing symptoms and induction of labor will be required. The method is: intramuscular injection of cloprostenol 0.2 mg in the morning from 8 to 10 am, usually on the second day before the baby can be born. If no litter can be injected with oxytocin 10 to 20 units (1 to 2 ml), generally can produce litter.
Second, midwifery
The normal sow delivery is to produce a piglet every 5 to 30 minutes, which takes about 2.5 to 5 hours to produce. If one piglet has not been produced in 45 minutes, first perform a midwifery and then use artificial midwifery.
1. Drug midwifery. The method is to inject oxytocin. The injection volume is 1 ml per 100 kg of body weight. Usually a sow is injected with 2 ml of oxytocin. If you haven't yielded for 45 minutes, you can inject a second dose. Do not increase the dose as much as you like, because large doses of oxytocin cause the uterus to contract strongly and produce dystocia. For elderly sows or particularly difficult-to-produce sows, neostigmine or pilocarpine or pesoxerine (5-8 ml/head) can be injected. Because practice shows that the use of oxytocin alone is not ideal.
2. Artificial midwifery. Preparation: The midwife's nails are cut short and polished. Hand and arm (to shoulder) should be washed. The net and ground behind the sow should be cleaned. A clean pot of warm water, water temperature 30 °C ~ 40 °C, put a few grains of potassium permanganate, the concentration of 0.1%, pink color is appropriate for the water. Do not overdo it because potassium permanganate is highly oxidizing and can easily burn the arms and sows' birth canal. Wash your hands and arms with potassium permanganate and wash the sow's cunt. Bring long-armed latex gloves, but also directly with the arm, the glove or arm painted with paraffin oil (also available soapy water). Method: The midwife rolled the hand into a cone and the palm of the hand was facing the sow's back. When the sow had intermittent pain, she slowly extended her arm into the birth canal. When reaching the sow, stop reaching. When touching the head of the piglet, insert the thumb and forefinger behind the canine teeth and slowly pull the piglet out. When touching the hind leg of the piglet, place the middle finger between the hind legs of the piglet and pull it out. When two piglets huddled together, push one back and pull one out. When you encounter a piglet bowed across the birth canal, push the piglet back and pull it again. Note that when the sow is restless, it must stop reaching into the arm, otherwise the sow will feel pain and suddenly sit up and crush the arm. When you encounter a piglet with a placenta coat, remove the tire and remove it. Do not pull on the tires, umbilical cords, vaginal walls, and vaginal walls. When the sow is in charge, she begins to pull the piglets outwards, the action is lighter, and the sows stop pulling when they contract. After giving birth to the midwives, the sows were washed with drugs and 4 intramuscular injections of penicillin (160 units), 2 streptomycins, and 1 analgin were used for 3 days.
Only 1% of the sows have a difficult-to-produce rate, and the first-born sows are more prone to dystocia. Artificial midwifery has a great influence on the sow's health and reproductive performance, and no artificial midwifery is necessary.
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