The use of light to prevent diseases and promote long

When bactericidal and bactericidal diseases occur, litter and forage grass contaminated with diseased livestock and poultry are exposed to sunlight and can kill pathogenic microorganisms. When a sick animal has a wound, it may also be exposed to dryness to dry the wound, kill the pathogen, and prevent infection.

Prevention and treatment of young animals with rickets, can be exposed to sunlight for a longer period of time, promote the conversion of vitamin D, improve the symptoms of the disease. Healthy livestock can also protect against rickets and osteoporosis through sunlight.

Improve the metabolic winter and spring seasons, shorter duration of light, relatively weak animal and animal metabolism. At this time, allowing the livestock and poultry to prolong their exposure to sunlight can increase their appetite and increase their metabolic capacity. This will increase the vitality of livestock and poultry. At the same time, it can enhance the body's immune function and the ability to resist external infections.

The regulated breeding experiment found that when the adult chickens had less than 10 hours of light per day, the egg production would be reduced, and the illumination time would be less than 8 hours, and the production of eggs would stop completely. While 10 to 12 hours of light per day can stimulate egg production, prolonged light can increase egg production, but over 17 hours, egg production will decrease. Therefore, it is appropriate to control the daily illumination time of laying hen houses from 14 to 16 hours.

Increasing production In general, mammals produce seasonal changes in milk production. By artificially increasing or decreasing the length of the light, it is possible to change this pattern so that the milk yield is kept at a peak for a long time. The wool production also has this obvious seasonality. Using artificial methods to shorten the light time can slow the growth of the wool; gradually extending the light time can speed up the wool growth. The same method also applies to various fur animals. Artificially controlling the light also allows the hen to change the timing and speed of moulting, reproduce the peak of egg production, and greatly increase the egg production.