The so-called lighting control is the use of artificial or modern electronic technology to simulate the changes of the natural light cycle, to provide appropriate light time and intensity for the breeding and moulting of leeches in order to enable the leeches production to develop in a direction that suits human needs more quickly.
In the long-term evolutionary process, the growth and development of leeches and their reproduction have formed inextricable links with the changes of the natural photoperiod. In the natural state, the leeches change with the seasons, that is, they reproduce 1 time per year with the change of the natural photoperiod and change hair twice. In the artificial light control state, leeches can be bred at any time of the year, and the breeding cycle can be effectively shortened to achieve 3 births per year. At the same time, the leeches can be matured in advance and slaughtered in advance, which can save feed expenses and management expenses and greatly reduce production costs.
The artificial light control scheme has nothing to do with the date of starting the shortening of sunshine. Even in the hot summer months, giving a short day of otters can promote long winter hairs in summer. However, it should be noted in production that there is a period of winter hair growth in leeches. After maturation of winter hair, prolonging the illumination time can accelerate the development of sexual organs, but it does not cause the growth of summer hairs. It does not begin until the gestation period begins. If you extend the light before winter hair matures, it will prevent the development of winter hair and inhibit the growth of sexual organs. Therefore, farmers should pay attention to the best time for artificial light control.
In order to shorten the reproduction cycle, production is usually conducted on December 21st with light control, and light is given for 1 hour per day. It is extended to 8 hours per day on January 1 and then increased by 15 minutes to 30 days every 5 days. In minutes, by May 1st the following year, sunshine hours reached 15 hours and 25 minutes. Using this method, the fertility rate of leeches can be significantly increased. In order to promote the maturation of winter hair, the light control is generally started on June 21st in production. Most of them adopt 40-watt fluorescent lighting. The artificial light cycle changes to 2 times the local natural light cycle change rate, and is adjusted once a week to make the light shine. The rapid shortening of time promotes the rapid development of winter hair, which generally matures on the winter of October 6th.
7 days to 8 days after the breeding is completed, the lamp is used to extend the illumination, and the light hours per day reach 14 and a half hours. When the lamp is turned on, the cover of the light control booth is opened so that the otters can fully receive the light until the production of the child ceases. Using this method, the newborn child is lively, robust, and has a high survival rate.
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