Summer sow FAQ

1. Why is the sow feed intake low in summer and how much is normal?

Pigs have no sweat glands, are not good at evaporating heat through the skin to regulate body temperature. When the feeding environment temperature exceeds the optimal temperature range, the pig's heat production is greater than heat dissipation. In addition to enhancing respiratory evaporation and radiation heat, pigs also reduce body heat by reducing feed intake. Produced to regulate body temperature balance. When the body temperature balance of the body cannot be maintained by increasing heat dissipation and reducing heat production, the body temperature of the pig is raised and the appetite is reduced.

The four months of 6, 7, 8 and 9 are when heat stress is high. The feed intake of sows is generally reduced by 1/3. When more, the feed intake (daily) can be reduced by about 2 kg. When the climate is suitable, the average feed intake of the sows during the lactation period is 5-6 kg, and the average feed intake of the lactating sows in summer is 4-5 kg ​​or less. Therefore, the low feed intake of sows in summer is normal. The key to solving feed intake in summer is the environmental cooling. In the case that the environment has not been improved, it is necessary to change the nutrient concentration of feed, make feeding management and care to change low. Adverse effects of feed intake.

2, the reason behind the summer sow constipation

The main reason for constipation is that the intestinal peristalsis is slow and weak, and the feces stay in the intestine for too long. In the late pregnancy, the fetus oppresses the intestines, causing slow intestinal peristalsis; after birth, the whole body is in a relaxed state, and the peristalsis of the intestines is also slowed down. Therefore, prenatal and postpartum sows are prone to constipation. Feeding mode before and after childbirth is very important. Direct feeding of breast milk in the late pregnancy and unpredictable prenatal and postpartum feeding will increase constipation. In summer, sows have severe heat stress, and the gastrointestinal function is greatly affected; there is no appetite intake after delivery; the incidence of postpartum inflammatory infection is large, which is the cause of constipation.

Constipation from the perspective of Chinese medicine, it is the internal heat can not be discharged, summer heat stress is exacerbated by the heat of the sow, so that the secret is even more powerful. Bran has a laxative effect, but the amount is small and ineffective, the amount of metabolic hyperthermia is severe and the feed nutrient concentration is lowered; the ethidium salt such as magnesium sulfate has a good effect and the price is low, but the long-term addition of the feed causes the uterus, anus, etc. The contraction ability of smooth muscle is weakened (the risk of miscarriage), and the exhaustion of exhaustion leads to a decrease in the contractile ability of the intestine itself, which leads to dependence and constipation. Therefore, the incidence of constipation should be reduced by reducing the cause of constipation and regulating the health of the gastrointestinal tract, rather than relying solely on feed to eliminate constipation during lactation.

3. Why do sows in summer have more inflammation? How to control

Sow labor consumes a lot of physical strength, poor resistance after birth; the genital tract is severely damaged during the littering process; the cervix is ​​slowly closed 4 days after birth, and the bacteria are easy to invade. Summer heat causes sows to increase labor, postpartum is weaker, and bacteria are more likely to breed, so summer sows have more postpartum inflammation.

Once inflammation occurs, it is difficult to cure, especially chronic endometritis, so the sow reproductive tract disease is important to prevent. 1) Antibiotics can be anti-inflammatory and bactericidal, but long-term abuse of antibiotics has led to bacterial resistance, so it is unclear which antibiotics are effective and how much is added. Moreover, due to national regulations and low feed intake, it is difficult to prevent the addition of feed, and it is necessary to rely on the pig farm's own health care, which is prone to antibiotics and affect the health of the sow. Because antibiotics can not only damage the liver and kidney function of the body, affect the fetus, but also destroy the micro-ecological balance in the vagina and affect the body's own recovery ability. 2) Sterilization with antibiotics is only a cure, and starting from the source will result in inseparable antibiotics but not good results. 3) Nutritional pathways should be used to slow down stress, enhance sows' physical fitness, shorten labor, increase body self-purification and restore function. However, if the hygiene or disinfection is not done well, the sow is surrounded by germs, and it is difficult to have a good effect only by the nutritional pathway. Therefore, we should pay attention to feed rather than relying on feed. The focus should be on nutrition (good feed) and sanitation to reduce the infection of pathogens, supplemented by effective, low-dose antibiotics to prevent it.

4, the reason for the difference in sow milk

The nutrients needed for the sow's milk are mainly from the feed, so the quality of the feed determines the quality of the milk to some extent. However, there are many factors that affect the quality of milk, so that the feed can not play very good efficiency: 1) low feed intake, summer heat stress, improper prenatal and postnatal management, partial fertility in pregnant sows, sow inflammation Constipation will affect the feed intake of lactating sows. The intake of low-yielding milk is not enough nutrients, and the amount of milk is small. At this time, the body of the sow will mobilize fat to produce milk, which leads to excessive fat in the milk and diarrhea in the piglets. 2) Postpartum mastitis and endometritis affect both the milk and the health of the piglets, and the pathogens directly cause the piglets to be unhealthy. 3) The sows have different fetal times and the quality of the milk is different. 1, 2 fetuses, 6 or more sows with 3, 4, and 5 fetuses. 4) The milk yield is related to the sucking ability of piglets. The number of litters is large, the piglets are strong and strong, and the milk yield is large. 5) The quality of milk is generally judged by the long speed of the piglets, the pull of the piglets, etc., but the long speed and resistance of the piglets are also related to the environment, the birth weight and the number of litters.

5. Why do sows have poor reproductive ability in summer?

Excessive heat production can not be released in the body, it is easy to keep the body temperature high, leading to changes in the pig's neuroendocrine system, thus affecting the reproductive performance of the sow:

Heat stress affects the feed intake of lactating sows, which leads to a decrease in lactation. The suckling pigs grow slowly, have many diarrhea, and have poor resistance.

Sows have poor resistance during heat stress and are prone to infection after delivery; high temperature and high humidity environment bacteria are easy to breed, so summer sows have more postpartum inflammation.

Sows have low feed intake and constipation during heat stress, which intensifies infections with low feed intake and inflammation.

Heat stress leads to ovarian function and sexual function decline. Young sows have delayed puberty and sexual maturity. Post-weaning sows have delayed estrus, recessive estrus and even estrus, and the conception rate is significantly reduced.

When the temperature reaches above 32 °C, the sows are bred, about 20% of the pigs are infertile or repeated estrus, and the abortion rate increases; the high temperature makes the number of embryo survival within 8 days after breeding significantly reduced, and secondly within a few days of embryo attachment (fetal After 11-20 days), it is particularly sensitive to heat. After 20 days, it has strong heat resistance. In the late pregnancy, the number of litters and live litters can be reduced by 1-2.

6, how to raise summer sows

In summer, the feed intake of sows is low. When the conditions of the bar are fixed, it is difficult to increase the feed intake. It is necessary to increase the nutrient intake by increasing the nutrient concentration of the feed. Therefore, it is best to use high proportion, high quality and high in summer. Nutrient concentrations of lactating sows to improve milk and improve sow health.

612 and PIG_C1P1 adopt high nutrient levels, and the nutrient intake is higher in the same feed intake; at the same time, the appetite of the sow is improved and the palatability of the feed is improved through various ways. It can relieve stress from nutrition, enhance sow's physique, shorten the labor process, increase the body's self-purification and recovery function, and at the same time cooperate with prenatal and postnatal care and feeding management, treat both the symptoms and the root causes, and solve the summer sow problem systematically.

Therefore, in the summer, environmental cooling, good lactating sow feed, scientific feeding management, nursing and health care are all indispensable. It is necessary to start from many aspects to effectively solve low feed intake, constipation, milk water shortage and reproductive disorders.