When the ewes are normally delivered, the lambs will be born within 30 minutes after rupture of the amniotic membrane. Normal ewes do not need midwifery. When dystocia occurs, they need to determine the situation and take appropriate measures to assist them.
Basic principles of midwifery
When the observing ewes are difficult to produce, they should take midwifery measures as soon as possible. The sooner the midwives are, the better the effect will be. Keep the ewes in low, high, or supine positions and push the baby back into the womb for correction. If the membrane is not broken, it is best not to break it prematurely; if the membrane ruptures for a long time and the birth canal is dry, it is necessary to inject paraffin oil or other oils. When pulling out the fetus, slowly pull it out. When performing the fetal examination, protect the sharp instruments such as the knife and the hook so as not to damage the birth canal.
Causes of dystocia and midwifery measures
Ecstasy abnormalities caused by dystocia contraction and nuisance weak: When the tire coat is not broken, first gently massage the ewes abdominal wall, and push the abdomen part of the upward and rearward push to stimulate the uterus to contract, after 30 minutes still without the delivery, can be carried out Midwifery. When the fetal fluid has flowed out, the ewes can be injected subcutaneously with 2 to 3 ml of pituitary injection or 1 to 2 ml of ergot injection, or 1 to 5 mg of fresh ergot (use ergot to open in the cervix and the fetus When the discharge is not hindered; the fetus position, posture or pelvic stricture, malformation can not use ergot, otherwise uterine rupture may occur). When the uterus is fully opened, the fetus can be pulled out by hand. If the cervix is ​​opened very small, the caesarean section can be performed as soon as possible and the fetus can be removed. Defeat and overstretch: First we must make the hindquarters of the ewes higher than the front to ease the contact and pressure of the uterus to the pelvic bones, so that the contraction is weakened, and then the ewes can be fed with 80 to 100 ml of white wine or Intravenous chloral hydrate or the ewes' back skin.
Stenosis of the pelvis (stenosis of the hard birth canal) Erection of paraffin oil, soapy water, or any kind of vegetable oil into the ewes' birth canal, and then forcefully pull the fetus; the front legs of the fetus can be rotated to pull the two front legs in turn, when the pelvis is in front, The fetal longitudinal axis can be twisted first to make it lateral and then pulled out. If there is bone intrusion in the birth canal, it can be performed as early as possible.
When the vulva of the soft birth canal is narrow, when the vulva is narrow, apply disinfecting oil first, then carefully insert it into the vulva, slowly expand the vulva in the upper part of the perineum, and then pull out the fetus.
Vaginal strictures can be filled with a large amount of vegetable oil, soapy water, or paraffin oil into the ewes' vagina. The front part of the fetus is pulled up on the rope and pulled out with fingers. If this method is not effective, you can cut the mucosa at the vaginal stenosis to pull out the fetus.
At the beginning of the stenosis of the cervix, patients should wait patiently and check the extent of cervix dilatation from time to time. You can also use the hand to try to expand, but this method only applies when the cervix has been opened slightly. When the above method is ineffective, the ewe is protected and anesthetized, then the vulva and the vagina are disinfected, and the hidden blade knife is inserted into the cervical canal to cut the wall from front to back (only the circular muscular layer is cut). Permissive caesarean section when approved.
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