Cow dystocia refers to a delivery disease caused by the abnormality of the fetus, birth canal and labor force during the production process, resulting in the fetus not being discharged in time. If the necessary diagnosis and treatment are not taken after the cow has dystocia, it will lead to the death of both mother and child, which will bring huge economic losses to farmers. Therefore, the cow dystocia must be carefully examined, take symptomatic treatment.

1. Causes of dystocia

Productive dystocia refers to the dystocia caused by premature shrinkage of cows, or shrinkage, weakness, uterine hernia, premature outflow of amniotic fluid and other factors. Birth canal dystocia, refers to the cow's cervical stenosis, not fully open, or vulva, vaginal stenosis, uterine torsion or uterine tumors and other factors caused by dystocia. Fetal dystocia refers to dystocia caused by abnormal fetal orientation, abnormal fetal position and abnormal fetal position. In addition, fetal malformation, oversize or twin pregnancy when the two together embedded in the birth canal, etc., can also lead to dystocia.

2. Clinical symptoms

Sick cattle showed a slightly depressed spirit, mild congestion of the conjunctiva, weakness of the limbs, unable to stand stably, and bulging of the left part. Rumen dropsy can be judged by percussion and auscultation. Body temperature is generally39.4℃, breathing is33Times/minThe pulse is69Times/min. At the same time, observe whether the vulva of the cow is exposed to a certain part of the calf, such as the hoof, etc., and conduct a vaginal examination to determine whether there is an abnormality in the fetal posture. If the fetus has stopped sucking and has no heartbeat, it can be determined to be stillborn. If the fetus stays in the birth canal for a long time after death, there will often be local corruption to form emphysema, and the contents of the uterus emit a foul smell. In addition, the cow's uterine wall will appear strong shrinkage, Nu blame.

3、MidwiferyMeasures

Symptomatic treatment. If the cow's birth canal is not fully opened and the cervix is too tight, procaine can be injected at the cervix to make the cervix dilate, and then the fetus can be slowly pulled out. If the cow has dystocia due to incorrect fetal position, the method of babysitting and child protection should be adopted for reasonable midwifery. For example, when the fetal head and neck are bent sideways, the midwife can hold the fetal lip by hand and then straighten the fetal head. If the fetal head is obviously bent, the fetus should be pushed hard to form a certain space in front of the pelvic entrance, and then the fetal lip should be held by hand to straighten the fetus. If it is not easy to pull the fetus, an obstetric rope with a living knot can be tied on the fetal mandible, after fastening, the operator pinched the lips and tongue of the fetus with thumb and middle finger to press the fetus to the opposite side. At the same time, the assistant cooperated with the pull rope to straighten the fetal head. In front of the wrist of the fetus, if only one wrist joint is anterior, the operator should push the fetus forward with his hand, hook the fetal hoof tip and lift it up vigorously to urge the fetal hoof tip to extend into the pelvic cavity. If both wrists are anterior, the above methods can be adopted step by step. If the cow's pelvic cavity is narrow and the fetus is too large, the fetus should be sent back to the birth canal or uterine cavity, and then the posture, position and direction of the fetus should be corrected. When the fetus is forcibly pulled, it is necessary to ensure that the cow is well fixed and an appropriate amount of sterilized paraffin oil is injected into the birth canal to make the birth canal smooth and protect the mucous membrane. Then, according to the rhythm of the cow's responsibility, the surgeon guides the assistant to pull the direction, strength and time of the fetus to prevent damage to the birth canal. If the fetal position cannot be corrected, and the pelvis and cervix are narrow, it is necessary to take a caesarean section in time. In the event of stillbirth, measures should be taken to protect the mother and discharge the fetus from the birth canal as much as possible to avoid its retention in the abdomen.

Postpartum care. Dystocia cows should be fed with green feed that is easy to digest and contains comprehensive nutrition after surgery, starting with a small number of times, and then gradually increasing until it returns to normal. If the cow is very weak after delivery, it is necessary to strengthen the heart and rehydration in time to supply sufficient energy. In terms of daily management, it is necessary to ensure that the enclosure is dry and clean, maintain good hygiene, and the temperature and humidity are appropriate, strengthen care, and promote the early recovery of reproductive organs, so as to ensure that they can reproduce normally in the future.

4. Preventive measures

Pre-labor inspection. Generally speaking, it is more difficult to prevent dystocia in cows, but some dystocia that have just appeared can be converted into prosper. Therefore, it is necessary to carry out labor inspection to convert these dystocia into prosper in time. If there is no timely birth check-up. The fetus will be under the contraction of the uterus so that the forequarter into the pelvic cavity, resulting in severe curvature of the head and neck, resulting in dystocia. But if a little processing at this time, both to avoid dystocia, so that the fetus can survive, but also to prevent the occurrence of dystocia and damage to the birth canal. Under normal circumstances, the cow from the exposed fetal membrane to the fetal water discharge, when the anterior part of the fetus has just entered the pelvic cavity, it is the time for labor examination. That is, after the vulva of the cow and the arm of the manipulator are disinfected, the hand is put into the vulva, and the fetus is palpated through the amniotic membrane or into the amniotic sac. If the amniotic membrane is not ruptured, be careful not to tear it to prevent premature outflow of fetal water and affect the discharge of the fetus.

Correct delivery. In the early stages of fetal production, if the diameter of the cow's cervix is less5　cmIf premature traction will inevitably lead to the neck is torn. In addition, if the midwifery is not carried out in time, the dystocia will last for a long time, and the amniotic fluid will run out, which will cause the vagina to be too dry, thus affecting the discharge of the fetus. The fetal traction should be carried out with the cow's effort and ensure that the direction of traction is consistent with the pelvic axis. in the fetal3During the discharge of a relatively large part (I. e., the head, two forelimbs, scapula and pelvis), midwifery should be carried out carefully. When the head has been expelled from the vulva, the direction of midwifery is suitable to be downward.45., At the same time, cooperate to press the fetal head with your hands. When the scapular part passes through the birth canal, the two forelimbs should be stretched out in parallel alternately one after the other. The pelvic pulling direction should be downward to urge the fetus to be pulled out as soon as possible. During the whole delivery process, arrangements will also be made.1The person carefully protects the cow's labia to avoid rupture. Under the right circumstances,1People can succeed in traction, and if the degree of dystocia is more serious, only arrangements are needed.4People pull below, otherwise it may seriously damage the cow's birth canal. If a special dystocia occurs, immediately take a caesarean section or other operations.