The role of light in pig production
It is only 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 portions of infrared and visible light can regulate the thermal function of the pig body. Since infrared rays can penetrate the skin by several centimeters, warming deep tissues, promoting skin blood circulation, accelerating metabolism and cell regeneration process, it has analgesic, anti-inflammatory and wound healing effects. Appropriate solar heat radiation and sun bath not only make the pig feel comfortable, but also has certain bactericidal and cell maturation effects. It also kills or inhibits certain hi-negative parasites and reduces the occurrence of skin diseases. rate. However, long-term exposure to direct sunlight, red light from 600 nanometers to 1,000 nanometers can penetrate the skull, increase intracranial temperature, and lead to “brain flare†of brain damage. Pigs show signs of anxiety, fainting, phlegm, and other heat-stroke symptoms. It will die from breathing and circulatory disturbances. The eyes receiving excessive solar radiation can cause symptoms such as visual disturbances, cataracts and retinal detachment, which can cause temperature rise in the lens and intraocular fluid. It can be seen that the intense solar radiation at high temperatures during the hot summer is not conducive to pig's body heat regulation, productivity and health. On the contrary, in the cold season, attention should be paid to the sun and lighting of pig farms and pig houses. It is of great significance for alleviating cold stress, promoting pig health, and improving microclimate in pig houses.
UV light in the sun has a strong biological effect. Appropriate ultraviolet radiation can cause 7-dehydrocholesterol in the skin to become VD3, thereby promoting the absorption of calcium in the intestine, promoting bone growth and development, and preventing rickets. Ultraviolet light also promotes metabolism in the body, which can improve pig productivity and Feed conversion rate; UV also has the effect of killing bacteria and virus fungi and enhance immunity. However, excessive UV irradiation can cause dermatitis in pigs.
Increase nighttime lighting for pigs to feed, increase nutrition, and promote growth. Ample light can promote sexual maturity in pigs, and is beneficial to estrus, breeding, pregnancy and growth of pigs. Sunshine can promote the absorption of VE and the normal functioning of sexual function in breeding pigs. Longer illumination time can promote the development of gonadal system and early sexual maturity; short illumination, especially persistent darkness, inhibitive system development and sexual maturity delay. In actual production, we all know that for a long-term unemotional sow she can be exposed to the sun for a while after the sun can be normal heat.
Bright light slows down the deposition of fat in pigs, and dark light accelerates fat deposition in pigs. Changes in light intensity have a significant effect on sexual maturation in pigs. Practice has shown that pigs reared in open pigs mature significantly earlier than pigs housed in closed homes. Illumination significantly affects the immune function and body material metabolism of pigs (especially piglets). Prolonging the illumination time or increasing the light intensity can increase the function of the adrenal cortex, improve the immunity, promote the appetite, enhance the digestive function of piglets, and increase the speed and survival rate of weight gain. However, strong light can also cause pigs to be excited and irritated, increase the activity time of the pigs, reduce the rest time of sleep, affect the growth and development of the pigs, and even appear poor feeding and malnutrition. The mortality rate of young pigs will increase. The weak light calms the pig, slows down the reaction, reduces the reproductive rate, and decreases the body's physical fitness.
Warning light generally used in the maintenance of road safety, is usually used in the police car, truck, fire engine, ambulance, prevention management, road maintenance vehicle, tractor, car emergency A/S car, mechanical equipment, such as development, machinery, electricity, machine tools, chemical industry, telecommunications, shipbuilding, metallurgy and other electric control circuit for controlling the signal interlock, and so on.
In recent years, solar warning lights have gradually replaced conventional battery warning lights.
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