Hello everyone, I believe there are still many friends who don’t know much about the causes of stillbirth and the reasons why sows have stillbirths. It doesn’t matter, I will leave it to you today. Let me share with you the reasons for stillbirth and the reasons for stillbirth in sows. The article may be a bit long. I hope it can help everyone. Let’s take a look below!
Contents of this article
- What are the reasons for stillbirth in sows
- Causes of stillborn eggs in quails
- What happens when sows give birth to stillborn eggs >
- The reason why Huang Yuan stillborn in the late hatching period
- What is the stillbirth of a sow? Reason
- What is the reason for stillbirth at 8 months
1. What are the reasons for stillbirth in sows
1. There are many reasons for stillbirth in sows, mainly including feeding and management , infectious diseases, malnutrition, environmental factors and production reasons, etc. Among them, improper feeding and management, sow infection, malnutrition and environmental factors are the more common reasons.
2. For example, improper feeding and management may lead to immature sows for breeding, stress reactions, improper care and other problems, while sows are infected with diseases such as swine fever. , porcine parvovirus disease, porcine pseudorabies, etc. can cause fetal morbidity and death.
3. Malnutrition is also an important reason. If the food given to the sow is single or insufficient, it will lead to poor growth of the sow and no excess nutrition for the fetus. growth, resulting in stillbirth.
2. Reasons for quail stillborn eggs
1. Embryos often die during the incubation period, causing losses to farmers. There are many causes of embryonic death. The author now summarizes the analysis of the four stages of early, middle, late and hatching as follows.
2. 1. The eggs are contaminated with pathogenic bacteria. The pathogens are mainly Escherichia coli, Salmonella, etc., or they invade the hatching eggs through the mother, or the eggs are not handled properly during inspection and are directly infected by the bacteria., causing embryonic death. Therefore, hatching eggs must be strictly disinfected within 1 hour after laying and before hatching. The method is to spray 1:1000 chlormethonide solution on the surface of the hatching eggs, or fumigate for 20 to 30 hours with 30 ml of formalin and 15 g of potassium permanganate per cubic meter of space. minutes, and keep the temperature at 25~27℃ and the humidity at 75%~80%.
3. 2. The storage period of hatching eggs is too long. Embryos from old eggs die within 2 to 3 days of hatching. During post-mortem examination, foam appears on the surface of the blastoderm, the air cells are large, and the mesangium is loose. Therefore, the eggs should be hatched within 7 days after laying.
4. 3. During transportation, the eggs are violently shaken, causing the mesangium to relax and break, and the air chambers to flow, causing embryonic death. Therefore, hatching eggs must be light, fast and stable when transferred, and shockproof work must be done during transportation.
5, 4. Eggs lack vitamin A. The embryo lacks necessary nutrients and leads to death. When raising quails, the diet should be rich in nutrients and comprehensive.
6. Mid-embryonic death is mainly characterized by abnormal embryonic position or malformation. Mainly caused by the lack of vitamin D and vitamin B2 in hatching eggs. The breeding of breeding quail should be strengthened.
7. 1. Due to poor ventilation, he died of suffocation due to lack of oxygen. An autopsy showed congestion or congestion in the organs and blood in the amniotic fluid. Therefore, it is necessary to keep the incubation room well ventilated, with fresh air, O2 reaching 21%, CO2 0.04%, and no harmful gases.
8. 2. The temperature is too high or too low. If the temperature is too low, embryonic development will be retarded; if the temperature is too high, the organs will be heavily congested and hematoma will occur. The principle of temperature control during the incubation period is high in the front and low in the back, that is, 37.8℃ in the early and middle stages and 37.3~37.5℃ in the late stage.
9. 3. Humidity is too high or too low. If the humidity is too high, the embryo will appear \”edema\” and the gastrointestinal tract will be filled with fluid; if the humidity is too low, the embryo will become \”mummified\” and the shell membrane and villi will be dry. The humidity control principle is high at both ends and low in the middle, that is, the humidity in the early stage is 60% to 65%, the middle stage is 50% to 55%, and the later stage is 60% to 70%.
10. Death after hatching is manifested by failure to peck the shell or death due to failure to peck the shell. The reasons are: ① The eggs lack calcium and phosphorus; ② The beak is deformed. The breeding of breeding quail should be strengthened.
11. Based on the above reasons, it can be seen that the death of quail embryos in the early stage is mainly due to poor hatching eggs, orDue to endogenous infection, the middle stage is mainly due to malnutrition, and the later stage is mainly caused by poor hatching conditions. Farmers should prescribe the right medicine, strengthen management, and actively prevent in order to achieve maximum economic benefits.
3. What happens when a sow gives birth to a stillbirth
1 There are many reasons why sows give birth to stillbirths. The most common ones are excessive temperature in the farrowing room and insufficient nutrition during delivery. If the temperature in the delivery room is too high, sufficient oxygen will not be available inside the uterus, which will reduce the contraction ability of the uterus, prolong the delivery time, and cause the baby to suffocate.
2. If a large amount of concentrated feed is fed before birth, it will cause indigestion, food accumulation, and dystocia. Adjusting the temperature of the farrowing room or using birth aids can help sows give birth smoothly.
4. Reasons for Huang Yuan’s stillbirth in the late hatching period
1. The hatching rate of incubators is low and there are many stillbirths, which are caused by improper use of incubators and improper control of air temperature and humidity.
2. First of all, improper use of the incubator is one of the reasons for the low hatching rate and high number of stillbirths. During the incubation process, you must use the incubator according to the instructions. Especially when correcting the temperature and humidity, you must follow the instructions in the instructions, otherwise the incubation effect will be poor.
3. In addition, if the air temperature and humidity are not properly controlled, it will also affect the hatching effect. Too low air temperature and too high humidity will lead to low hatchability and many stillbirths. Therefore, before using the incubator, the air temperature and humidity must be strictly controlled.
4. In short, the hatching rate of incubators is low and there are many stillbirths, mainly due to improper use of incubators, improper air temperature and humidity control, etc.
5. What are the reasons for stillbirth in sows
1. Genetic defects: Inbreeding of sows can easily cause their offspring to suffer from serious genetic diseases. The smaller the genetic difference between male and female pigs, the greater the possibility of producing stillbirths.
2. Feed problem: Serious insufficient nutritional intake of sows during pregnancy can cause stillbirth. In addition, eating too much nutrients close to the expected date of delivery can also reduce the survival rate of the fetus. .
3. Environmental problems: Breeders do not keep sows in small groups or in isolation, causing attacks and mental stimulation on sows, which can easily lead to stillbirths.
What are the causes of stillbirth at six or eight months
8 The causes of fetal death may be fetal malformation, fetal umbilical cord prolapse, umbilical cord knotting, umbilical cord wrapping around the neck, severe genetic diseases, maternal and fetal blood type incompatibility, placenta previa, placental abruption, velamentous umbilical cord attachment and other abnormalities. Pregnant women who suffer from gestational hypertension, diabetes, or heart disease may also suffer from stillbirth.
This ends the content about the causes of stillbirth. I hope it will be helpful to everyone.
