With the development of large-scale farming, the stress syndrome has brought more and more harm to the pig industry, mainly due to slow growth, reduced production performance and product quality, as well as decreased immunity and serious direct death. Among them, summer heat stress can be said to be the most serious, which makes the pig's resistance significantly decreased, and the incidence of the disease rises linearly. In order to make the scale of raising pigs through the summer, Huinong.com compiled the following measures for the scale farm:
1. What is the heat stress response in pigs?
Porcine heat stress refers to the sum of all non-specific physiological responses of the pig to the thermal environment in a high temperature environment. The optimum temperature for pig life is: 27 ° C ~ 29 ° C for newborn piglets; 21 ° C ~ 24 ° C for weaned pigs; 15 ° C ~ 25 ° C for growing pigs; 16 ° C ~ 18 ° C for lactating sows. In the optimum ambient temperature range, the heat production and heat dissipation are balanced, the feed utilization rate is relatively high, and the pig's disease resistance is also stronger. When the temperature is above the optimum temperature range, because the pig's heat production is greater than heat dissipation, the pig needs to regulate the body temperature by reducing the body heat by reducing the body heat by reducing evaporation and radiation, and then heat stress will begin to appear.
Second, the consequences of pig heat stress
The direct consequence of heat stress is a decrease in excitability in the feeding center, which leads to a decrease in feed intake. And due to heat stress, the pig endocrine disorder, resulting in the body's thyroxine and adrenaline and other substances regulate hormone secretion disorder, which causes the body to reduce the metabolism of sugars, lipids and proteins, and then reduce the nutritional status of pigs. And disease resistance.
After heat stress, the pig must dissipate heat through respiratory evaporation, causing the respiratory rate to accelerate, excessive consumption of water and carbon dioxide, and formation of respiratory alkali poisoning, which causes changes in blood biochemical indicators of pigs, resulting in the destruction of acid-base balance in pigs. The concentration of immunoglobulin in the blood reduces the number of lymphocytes in the blood, leading to a decrease in the phagocytic ability of macrophages in the body, inhibiting the immune function of the pig body, leading to a decrease in the disease resistance of pigs. This is often a major cause of high incidence of red body in summer. .
Third, the response to pig heat stress
What are the anti-stress drugs commonly used for heat stress in pigs? Mainly include sugars (such as glucose, active polysaccharides, chitosan, etc.), vitamins, amino acids (lysine, methionine, tryptophan). , taurine, glutamic acid, etc.), electrolyte minerals (sodium bicarbonate, sodium chloride, potassium chloride, ammonium chloride, organomagnesium, selenium, zinc, chromium), _organic acids (lemon Acid, malic acid, humic acid, betaine, etc.), bovine hormones, chemical residues, Chinese herbal medicines, etc. The above listed drugs that deal with porcine heat stress are numerous, but their mechanisms of exerting anti-stress are also different. There are three main aspects:
1 regulate the central nervous system, calming sedation and reduce stress sensitivity (it is worth noting that taurine and gamma-aminobutyric acid can inhibit the regulation of central nervous system neurons, with stability, sedation, anticonvulsant The role of the body, thus reducing the body's response to stress, to prevent stress;)
2 Antioxidant, scavenging reactive oxygen free radicals, regulating the disorder of free radical metabolism caused by stress (the main way for many anti-stress agents to work, among which taurine, a-lipoic acid, astaxanthin are worthy of attention) Wait);
3 regulate the metabolism of various substances in the body and regulate the abnormal metabolism of the body caused by heat stress.
The above content is the prevention and control skills of pig heat stress, and it is hoped that pigs raised by pig farmers will have a smooth summer day.
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