How to deal with sow heat stress in summer? What kind of injection should I get?

Pigs are thermostatic animals with thick subcutaneous fat, underdeveloped sweat glands and slow heat dissipation, so pigs are not heat-resistant. Heat stress in summer is easy to affect the fecundity of sows, so how to deal with it? What kind of injection should I give if there is heat stress? Let's take a look at it.

What is heat stress

1. It is the sum of all kinds of non-specific physiological responses of pigs to thermal environment in high temperature environment.

two。 "stress" refers to the adaptive response of the organism itself to adversity in the face of pressure such as changes and adverse conditions. Stress is a series of complex life activities related to "nervous system, endocrine system and immune system". Stress is inevitable, and the size of the damage is related to the adaptability of the pig itself.

2. What are the symptoms

Shortness of breath (wheezing), reduced food intake (sudden sharp drop or even no eating at all), a substantial increase in the amount of drinking water, frequent play in the water, sleeping wetlands (such as rolling feces), reduced activity (or even lying on the side for a long time), mental depression (even completely ignoring the surrounding changes), red skin, elevated body temperature.

3. What is the harm of heat stress to sows?

1. The most suitable ambient temperature for sows is 19 ℃. When the mating rate exceeds 30 ℃, the mating rate decreases by 20%. Pregnant pigs are prone to miscarriage, stillbirth, and do not give birth after 114 days, resulting in an increase in mortality.

2. Heat stress affects estrus and conception rate of sows. Some studies have shown that at high temperature, the estrus of back sows is delayed by an average of 22 days, and when the temperature is higher than 28 ℃, the sexual maturity of sows is delayed. The time for weaning sows to return to estrus from July to September was longer than that in other months. The conception rate is also low in summer, and decreases gradually with the increase of temperature.

3. Affect the survival rate of sow embryos. The strong stress of high temperature not only makes the endocrine function of sows maladjusted, but also strengthens the peripheral blood circulation, reduces the blood supply in the body, affects the synthesis of protein, makes the embryos undernourished, and leads to early embryo absorption and death. as a result, the litter size is significantly reduced. In addition, high temperature can also make many adverse changes in the uterine environment, stillbirth, malformed fetus increased.

In addition, heat stress also affects the litter number of sows, affects the lactation performance of sows, reduces the lactation and feed intake of sows, so that pregnant sows can not take in enough nutrition, resulting in lack of strength during production.

Fourth, how to deal with sow heat stress

1. Improve the feeding environment

Strengthen the shading, ventilation and thermal insulation facilities of the pig house, such as building Arbor, planting trees and planting vines; thick mattress grass roof, double-layer roof, roof painted white; electric fan, ventilator, skylight, etc., the closed pig house can adopt wet curtain longitudinal ventilation and cooling system. Clean the feces in time, keep them clean and hygienic, and reduce the heat production by microbial fermentation in the feces. Often wash the floor and walls of the enclosure with cold water, and install fans and air conditioners as permitted to reduce the temperature of the pigsty.

2. Provide adequate clean drinking water

Provide adequate drinking water, and the amount of water consumed by pigs increases greatly when they are more than 10 ℃ above their body temperature. If the lack of water or exposure to the sun in the drinking pipe, resulting in a reduction in drinking water will aggravate the heat stress of sows. Pigs can be provided with 0.5% clean water to regulate body temperature and reduce heat stress.

3. Adjust the feed reasonably.

In the high temperature weather, the feed intake of sows decreased, increased the dietary nutrient concentration, especially the contents of energy, protein and vitamins, and tried to meet the nutritional supply when the feed intake of pigs decreased. Lysine can be added to the diet as appropriate, which can effectively reduce the adverse effects of heat stress and achieve better production results. High fat can be added to the diet, which can increase energy and shorten the interval between weaning and reestrus in sows. As fat is prone to oxidation and rancidity in summer, it is recommended to add antioxidants at the same time. Except during heat stress, fat should not be added to the diet of lactating sows. Adding fat to the diet of lactating sows will reduce the content of plasma insulin and the secretion of luteinizing hormone.

4. Adjust the feeding time

The feeding time can be changed from daytime to night. Empty trough during high temperature period, replenish feed during cool period, feed less frequently. In addition, in the heat source of livestock and poultry, the output of increased heat consumption accounts for a large share. Fasting in the empty trough during the period of high temperature is to reduce heat consumption and avoid the superposition of heat stress.

5. Pay attention to the addition of vitamins and trace elements

Under normal circumstances, the vitamin C synthesized by livestock and poultry can meet the needs, and vitamin C is generally not added to the feed. In the case of heat stress, the demand for vitamin C of livestock and poultry increases, which can be supplemented by feed or drinking water. Vitamin E also plays a role in anti-heat stress. There are some changes in the cells of the body during heat stress. The addition of vitamin E can stimulate the immune organs, enhance the immunity of the body, and improve the ability of anti-stress. Organic trace elements can be added under the condition of heat stress to meet the needs of sows for trace elements to the greatest extent.

6. Adding microecological agents to the diet

In the heat stress response chain of sows, free radicals directly cause damage to the body. Free radicals damage body cells, break maternal humoral regulation, cause metabolic disorders, and damage reproductive and immune systems. The main ingredients of our microecological preparations are: probiotics, antimicrobial peptides, NCG, oligosaccharides and so on.

Probiotics-improve intestinal health, reduce harmful gas production, and improve culture environment

Antimicrobial peptides-antibacterial and antiviral, improve immunity and enhance the anti-stress ability of sows

NCG-- promotes the synthesis of arginine, promotes vascular development, and increases the oxygen supply to the placenta.

Heat stress has caused huge economic losses to the pig industry, which is a practical problem commonly faced by pig producers. Through the regulation of nutrition, coupled with the improvement of feeding management, combined with the use of vitamins, trace elements and microecological agents, the negative effects of heat stress on sows can be effectively alleviated. Improve the fecundity and utilization rate of sows as well as the comprehensive economic benefits of breeding.

What kind of injection should be given

It is generally supplemented with vitamins because animals consume a lot of vitamins and amino acids and other nutrients to regulate the balance under stress.