It is one of the important factors that have a direct effect on the survival, behavior and production of pigs. Infrared and visible light have a photothermal effect, in which the long-wave portion of infrared and visible light can regulate the thermal function of the pig body. Because infrared rays can penetrate the skin for a few centimeters, the deep tissue warms up, promotes blood circulation of the skin, accelerates metabolism and cell regeneration, and thus has analgesic, anti-inflammatory and wound healing effects. Properly accepting solar heat radiation and bathing in the sun not only makes the pig feel refreshed, but also has certain bactericidal and cell-promoting effects. It also has certain killing or inhibiting effects on certain negative-negative parasites, reducing the occurrence of skin diseases. rate. However, long-term direct sunlight, 600nm ~ 1000nm red light can penetrate the skull, so that the intracranial temperature rises, causing brain damage "sunshot disease", pigs show anxiety, fainting, paralysis and other symptoms of heatstroke, serious It will die due to breathing and circulatory disorders. Excessive exposure to solar radiation can cause symptoms such as visual impairment, cataracts, and retinal detachment due to warming of the lens and eye fluid. It can be seen that strong solar radiation during hot summer temperatures is detrimental to pig's body heat regulation, productivity and health. On the contrary, in the cold season, attention should be paid to the sun and daylight of pig farms and pig houses, which are important for slowing down cold stress, promoting pig health and improving the microclimate of pig houses. Ultraviolet light in the sun has a strong biological effect. Appropriate ultraviolet irradiation can make 7-dehydrocholesterol in the skin into VD3, which promotes the absorption of calcium in the intestine, promotes bone growth and development, and prevents rickets. Ultraviolet rays also promote metabolism in the body, thereby improving pig productivity and Feed conversion rate; UV also has the effect of killing bacteria, viral fungi, and enhancing immunity. However, excessive ultraviolet radiation can cause dermatitis in pigs. Increase nighttime light for pigs to feed, increase nutrition and promote growth. More adequate light can promote sexual maturity in pigs, which is conducive to pig estrus, breeding, pregnancy and growth. Sunlight can promote the absorption of VE and normal function of sexual function in breeding pigs. Longer light time can promote the development of gonadal system and sexual maturity earlier; short light, especially continuous darkness, inhibitory phylogeny, delayed sexual maturity. In actual production, we all know that individual long-lost sows can be escorted after being exposed to the sun for a while. Strong light has a slowing effect on the deposition of fat in pigs, and dark light can accelerate the deposition of fat in pigs. The effect of changes in light intensity on sexual maturity in pigs is also significant. Practice has shown that pig sexual maturity in open pig houses is significantly earlier than pigs kept in closed houses. Illumination significantly affects the immune function and metabolism of the body (especially piglets). Properly extending the illumination time or increasing the light intensity can enhance the function of the adrenal cortex, improve immunity, promote appetite, enhance digestive function of piglets, and increase the rate of weight gain and survival rate. However, glare can also cause pigs to be excited and irritable, increase the activity time of pigs, reduce the rest and sleep time, affect the growth and development of pigs, and even the phenomenon of eating and sucking, and the mortality rate of pups will increase. Low light causes the pig to calm down, the response is slow, the reproductive rate is reduced, and the constitution is degraded. Custom Indoor Electrical Junction Box,Motorcycle Parts Custom,Stamping Welding Silicon Stator Lamination,Custom Rotor Plate JIANGSU TONGDE INTERNATIONAL TRADE CO.LTD. , https://www.tongdetrades.com