Sows use oxytocin to stimulate the uterine smooth muscle, causing the uterus to contract and thus deliver the role of labor. When the sows have dystocia due to low levels of oxytocin in the body and weak uterine contractions, oxytocin can be used to induce labor. However, in the course of specific operations, the following matters need attention:
The contraction of oxytocin on the uterus is more effective after labor and just after delivery, but it is not effective when there is no sign of delivery.
The effect of oxytocin on the uterus is mainly used in the uterus and has a weak effect on the cervix. Therefore, when the uterine cervix is ​​not opened or the uterus is no longer contracted due to late birth, and the cervix has been reduced, the effect of oxytocin is not satisfactory.
If the pelvis is too narrow, the birth canal is blocked, the fetal position is not correct, and the sows with a history of caesarean section are disabled, otherwise the rupture of the uterus may result in death. Therefore, before using oxytocin, we must first check the birth canal, fetal position and whether there is a history of cesarean section.
When the sow is pregnant full-term, increased placental estrogen can soften the pelvic ligament. When the estrogen reaches a certain concentration and progesterone reaches a proper ratio, oxytocin can be used to act on the myometrium, so that the uterus has an admissible effect on oxytocin. Therefore, the use of oxytocin in the treatment of dystocia at the same time the amount of estradiol benzoate injection can increase the sensitivity of the uterus to oxytocin.
Pig placenta is a diffuse type placenta. The connection between the fetal placenta and the mother's placenta is not tight. The strong contraction of the uterus makes it easy to separate the two. If the fetus does not produce quickly, it may die of hypoxia. In the clinic, it can often be seen that the use of oxytocin in the treatment of dystocia produces more stillbirths, because the use of large amounts of oxytocin precludes fetal placenta from maternal placenta prematurely and leads to fetal hypoxia. Therefore, the dosage of oxytocin should be suitable. Generally 10-20 units each time, according to uterine contractions and fetal discharge can be considered repeated intervals of 2-3 hours, while combining other methods for midwifery.
Clinically, after using oxytocin, it is often caused by excessive exertion of sows that results in extreme fatigue of the body and weakness, affecting farrowing and postpartum banding. Therefore, when using oxytocin, it is necessary to strengthen the nursing of sows and supplement with enough energy and body fluids. Oxytocin is best diluted intravenously in 5% glucose saline.
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