1 Why is the feed intake of summer sows low and how much is normal?

Pigs have no sweat glands, can not regulate the body temperature through evaporation of skin heat. When the temperature of the feeding environment exceeds the optimal temperature range, the heat production of pigs is greater than heat dissipation. In addition to enhancing respiratory evaporation and radiation heat, pigs also reduce body heat production by reducing feed intake. To regulate body temperature balance.

The average feed intake of lactating sows is 5-6 kg when the climate is suitable, and the average feed intake of 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 Reasons for 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 summer sows have more inflammation and how to control them?

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, which not only can 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, the prevention of inflammation requires nutrition rather than relying on nutrition. 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 Reasons for poor 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 and quantity of milk, so that the feed can not perform very well: 1) low feed intake, summer heat stress, improper management of prenatal and postpartum feeding, and partial fertility of pregnant sows. Inflammation of pigs and constipation can affect the feed intake of lactating sows. The nutrient intake is low, and the amount of milk is low. 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 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.

However, factors such as feeding management and diseases will affect the performance of feed. Therefore, environmental cooling, scientific feeding management, nursing and health care are needed. It is necessary to start with many aspects to effectively solve low feed intake, constipation, milk water and reproductive disorders.