I. Will the application of 100% live birth yield to new production methods damage the birth canal and reduce fertility?
In a series of articles on how to achieve the goal of 100% live birth rate published in "Holstein" in April this year, I pointed out specifically that people who are concerned about active intervention will damage the reproductive tract and cause postpartum infertility. Therefore, Even if the 100% live birth rate is achieved, it cannot be easily asserted that the problem has been solved and the law is declared feasible. Only when these littering cows (if post-natal care is in place) are re-equiped and more than 85% of pregnancies are made, can we breathe a sigh of relief. I also said in that article: We still need to wait at least 6 months before we can reach a preliminary conclusion on the 100% live birth rate. It has passed four months since then. Although it has not yet reached six months, preliminary data support the 100% live birth rate to support the new law. The following data comes from the seven domestic dairy farms of Shenyang Huishan Dairy Group.
Table 1 Effect of implementation of new method of 100% live birth rate on postpartum fertility
Although Table 1 provides only two months of statistical data, it is necessary to continuously supplement new data, but there is no suspense that basically recognizes the 100% live birth rate to assist the new law of production. Furthermore, according to the statistics of Ge Hongliang, the director of breeding and breeding, severe dystocia is the cause of birth canal injury and sequelae, resulting in injury to the birth canal regardless of whether it uses the traditional delivery method or 100% live birth rate. The odds are around 2%~3%. What needs to be explained here is that Ge Hongliang once participated in the first phase of the training course for 100 field managers of the Huishan Dairy Group, which I spoke to with other people in 2011, and has a certain theoretical basis. I also personally assessed the actual combat capability and technology on the spot and found that he really meets the requirements of developed countries in the 1990s for the development of large-scale beasts and backbone technicians in modern dairy farms. These requirements have already been mentioned in the aforementioned article and are restated here as follows:
1. These personnel must correctly understand and use the 21-day pregnancy rate to timely and objectively measure the reproductive efficiency of dairy cattle populations.
2. These people must master the technique of sliding the membrane to determine if the pregnancy is correctly diagnosed 31 to 35 days after the cow is bred.
3. These personnel must correctly understand and consistently use synchronic ovulation techniques as a means of routine reproductive management of dairy cows, so that the group's 21-day pregnancy rate exceeds 25%.
Therefore, Ge Hongliang naturally deserved to be a dazzling star in the breeding of the seven family dairy farm chief Li Shanwen and the Shenyang Huishan Dairy Group! If young colleagues are interested in how to master the fetal membrane sliding technique of early pregnancy test, or would like to inquire about the details of the 100% live birth rate yield and the results and the impact on postpartum fertility, please call Ge Hongliang on his cell phone. number is.
Second, then, to this day, what is the effect of sticking to the traditional method of assisting production?
We still use the actual field data to answer, see Table 2. The data in Table 2 clearly answers the question of exactly which type of midfield method actually has a good effect. It is worth noting that the 19-year-old secondary school students who have passed the first pass have even scored more than the veterans who have passed the battles! This has to be thought-provoking. General Secretary Hu Jintao taught us: “Advancing with the times, scientific development concept.†I would like to share this with the senior citizens of the dairy farming industry with the words of General Secretary Hu. In the 1960s, Chairman Mao had warned: “The teenagers are challenging!†The situation is still the same today. The 19-year-old secondary school official named Xu Zhiqiang (see Figure 1) who has achieved an outstanding achievement rate of 98.2% in live birth rate is a regular pick-up employee in the delivery room of Yangjiabao Dairy Farm of Shenyang Huishan Dairy Group. The telephone number is to welcome young colleagues who are interested in raising the live birth rate.
Table 2 Comparison of the actual effects of traditional production methods and 100% live birth yield
Figure 1 Right is Xu Zhiqiang and Zuo Wei is the leader: Sun Baoyu, head of breeding at Yangjiabao Dairy Farm of Shenyang Huishan Dairy Group. Both are very young and are commendable heroes for picking up midfield jobs!
Third, what does the latest research of the United States mean to us?
In early 2012, the American colleagues published new research results on the management of dairy cows. They are briefly described below.
1. Re-evaluate the childbirth procedure scoring criteria. See Table 3.
In the database constructed using foreign herd management software, it is often required to record the delivery process of dairy cows using the above five-point system. Most dairy farms in China still use text descriptions, which is extremely inconvenient and difficult to unify the actual record of the delivery process.
Table 3 Scoring Criteria for Childbirth
2. Reference time for timely intervention, see Table 4.
Table 4 Reference time for timely intervention
I am grateful to the American colleagues for their rigorous and serious attitudes toward learning. However, if these studies are used to guide the practice of assisted production in large-scale modern dairy farms in China, there are obviously the following deficiencies:
(1) As far as the on-site work for midwifery is concerned, it is difficult to accurately record the time when there are more than 10 births per day, because there are other tasks such as filling the colostrum, replacing the grass, and entering the first stage of labor. The pregnant cows move into independent stalls, pushers, and camps.
(2) Observing too little once every two hours will certainly miss some pregnant cows in the first or second stage of labor. We advocate observation every 20 minutes.
(3) Set the 11%~15% dead-birth rate as the bottom line for adopting improved midwifery work is too low. We currently require that we strive to achieve a 100% live birth rate, that is, a 0% stillbirth rate.
In view of this, I still insist on the points clearly stated in previous articles:
(1) Observe closely, intervene promptly, use reasonable force, and avoid brutality!
(2) I would prefer to misuse 1000 and not miss 1!
(3) The presence of fetal hooves is still not visible in the 30 minutes after the amniotic sac is exposed, requiring immediate intervention.
(4) The yellow-brown liquid appears in the amniotic sac or flows out of the vagina and needs to be promptly intervened.
(5) If the cow is restless or repeatedly rests for more than 6 to 8 hours, it needs to intervene promptly.
(6) The cow has been strongly responsible for more than 30 minutes. No fetus has been exposed, or the hooves have been exposed. However, if he stops, he retreats and needs to intervene promptly.
(7) Only one fetal crocodile exposes the vulva, or two fetuses with the vulva explode upwards, or three to four fetuses expose the vulva, requiring timely intervention.
If the above situation occurs, if there is no active intervention and there is no doubt about it, it will cause the death of the fetus.
3. Redefine dystocia and midwifery
The definition of dystocia is: excessive extension of the first or second stage of labor; or the need to use special means to force the fetus out of the birth canal, such as using two or more free hands, or using a midwife, or doing caesarean section to pull out the fetus.
The definition of midwifery is: Mild fetal position is abnormally corrected and then pulled out; or in coordination with child-bearing culprit and pull-out force, pull out fetal mole.
Understanding the new definition of dystocia and midwifery will help shift the focus of post-natal care to post-partum cattle who really need attention. Following we continue to discuss how to do a good job in midwives.
Fourth, how do you correct midwifery abnormalities of the fetal position?
As early as the 1960s, graduates of veterinary colleges and universities in China obtained necessary training in this respect. At that time, the veterinary obstetrics textbooks led by professors Chen Beiheng and Wang Jianchen were also detailed textual descriptions and easy-to-understand illustrations. . To this day, veterinary professional training in Western developed countries has not changed much in this regard. As far as China's dairy cattle aquaculture production practice is concerned, on-site veterinary technicians are no strangers to the correct midwifery of the abnormal fetal position and are generally able to handle it smoothly. The tricky ones are the following two points:
1. Can't timely and correctly identify which fetal position abnormalities can be corrected? Which fetal position abnormalities can not be corrected?
2. The inability to deal with uncorrectable abnormalities in the fetal position, which generally involves the immediate implementation of Caesarean section without hesitation.
In view of this, this article should not repeat the contents of the veterinary obstetrics textbooks 60 years ago. It intends to make the following points for reference by fellow practitioners based on their own years of accumulated experience.
1. The need to pay special attention to obsolete and abdomen drooping labor cows because these cows have too long first and second labor due to weak abdominal muscle contraction, which causes the fetal placenta to prematurely leave the mother's placenta and cause fetal hypoxia. Death; It is also possible that the fetal position may be abnormal due to weak duties.
2. In the implementation of anomalous correction of the fetal position, it is important to keep in mind that there is only a maximum of 1 to 2 hours of treatment time. Exceeding this time limit, the fetus is likely to die of hypoxia due to placental separation.
3. In order to facilitate abnormal correction of the fetal position, it is generally necessary to push the fetus back into the uterus, leaving some room for correction. If the uterus is pushed back into the uterus and the cow is obstructed by a strong culprit, epidural anesthesia can be performed to overcome the culprit. However, although this makes the rectification process relatively easy, it is often forced to pull out by artificial force because after the correction is completed, no tire force is exerted to extrude the fetal mole.
4. When anomalous correction of the fetal position is performed, at least 2000 ml of paraffin oil should be poured into the birth canal to fully lubricate the birth canal, and sterility should be maintained throughout the entire operation process. Before surgery, the vulva and adjacent areas around the vulva should be closely sterilized.
5. When performing anomalous correction of the fetal position, care should be taken to wrap the sharpened portion of the femoral condyle with the palm of the hand, such as the hoof and mouth, so as to avoid scratching or piercing the uterine wall during the correction. In the event of rupture or puncture of the uterine wall, the cows will be more vicious, and most will die without treatment.
The following is a list of 17 simple diagrams (Figures 2 to 18) supplemented by concise textual descriptions that outline how to perform proper midwifery on abnormal fetal position. Readers interested, for more detailed information, can refer to our country. A new edition of "Veterinary Obstetrics and Gynecology" textbooks for veterinary colleges.
In short, according to my many years of experience in clinical practice, when abnormal fetal position occurs and the fetus is still alive, if correction is not easy and takes too long, I usually do not hesitate to do caesarean section because the correction time is longer than 1-2 Hours, fetal death often dies, and it hurts cows.
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