Dystocia is the collective name for the fetus's ability to produce from the mother's body at the time of delivery. After incomplete statistics on the data of Hunan Longhua Agriculture and Animal Husbandry Development Co., Ltd., it was found that the difficult rate on the farm was more than 5%. It is customary to classify dystocia as productive, obstetrical, and fetal dystocia. In the clinical practice of swine dystocia, dystocia is the most common, and other types of dystocia also occur from time to time, and type 3 dystocia can be transformed into each other and cause and cause each other. Cause of dystocia: There are two aspects of sow and fetus.
(I) Causes of Sows
1. Dysentery of birth canal stenosis is more common in primiparous sows. Since sows are still in the stage of growth and development after mating, the pelvic cavity mouth is too small. Although the sows are strongly contracted by the uterus, the fetus does not produce uterine septum.
2. Weak productive fertility is more common in sows with weak, sick, high parity, or far more litters. Due to fatigue caused by uterine contractions, unable to discharge the fetus from the birth canal, causing dystocia.
3. Urinary tract spasm dystocia more common in frail, disease and other causes of bladder paralysis, urine can not be discharged in time, the bladder accumulation of large amounts of urine, squeezing the birth canal caused by dystocia.
4. Stress-induced dystocia caused by external stimuli is more common in early-produced and timid sows. Due to sudden stimulation or uncomfortable environment in the delivery, strong external stimuli cause restlessness and the uterus does not shrink normally, causing dystocia.
5. Obesity, abnormalities in the birth canal, diseases, or dysplasia can also cause dystocia.
(b) Causes of the fetus
1. Excessive fertility of the fetus is more common in sows with too little litter size and excessive fetal development causing dystocia.
2. Misplacement of fetal position is more common in the fetus in the birth canal misplaced blocking the birth canal caused by dystocia.
3. Abnormal fetal dystocia Fetal malformation can not successfully pass through the birth canal, causing dystocia.
4. Fetus-born childbirth fetus in the mother's death time is longer, causing fetal edema, swollen cause dystocia.
5. Both fetuses enter the birth canal at the same time causing dystocia.
(c) Other reasons
Midwifery is too early, excessively frequent, rude operation, and improper medication, such as premature application of uterine contractions, excessive use of birth canal lubricants, etc.
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