Some sows have a long labor process and an increase in stillbirths. Induced labor can help pigs give birth as soon as possible. The best way to reduce stillbirths is to assist in childbirth. Effective assistance can increase the number of births by 0.5-1 per sow per year. Before assisting sows in childbirth, it is important to use pig ultrasound to conduct an evaluation.

The hormone control process during sow delivery is: a pig can maintain pregnancy because progesterone is maintained at a reasonable level. If gonadal hormones are injected, pig ultrasound can show that follicles begin to develop, estrogen increases, and progesterone decreases. When pregnancy cannot be maintained at a certain level, the sow begins to give birth. Oxytocin alone is not enough. If a sow wants to give birth, the progesterone level must drop and the estrogen level must rise. Oxytocin will only be secreted after delivery. If oxytocin is given first and other hormones have not yet been produced, it is useless. After hormones such as gonadal hormones are given, the corpus luteum begins to dissolve in 24 hours, and then the follicles begin to develop and the progesterone level decreases.

Pig B-ultrasound 

The risk of using hormones is very high. All pregnant sows are sensitive to gonadal hormones. When the corpus luteum is dissolved and destroyed, pregnancy stops, which may cause miscarriage. Therefore, drug treatment must be cautious, especially before 110 days of pregnancy. The use of gonadal hormones and oxytocin should be more careful. It is easy to cause an increase in stillbirths. Therefore, before using hormones, pig B-ultrasound should be used to check the condition of the fetus. The best time to use oxytocin and oxytocin is the first 1 day of the average gestational day. There is no difference in the time interval between sow weaning and the next estrus, so it can be concluded that gonadal hormones can induce delivery normally. If there are many large stillbirths in the pig farm, or if there are many manual deliveries, it is best to try oxytocin, but before using it, pig B-ultrasound should be used to check the condition of the sow and the fetus.

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