The Effect of Light on Breeding Rex Rabbits

First, mating male rabbit requires shorter and weaker light

Male rabbits prefer shorter light hours, which generally take 12 to 14 hours. Continuous light for more than 16 hours will cause weight loss and sperm count reduction in male rabbits, affect breeding ability, and even result in male infertility.

Second, reproduction of female rabbits requires longer and stronger light

At 20-24°C and under full darkness conditions, supplemented with 1 watt per square meter and light for 2 hours, the female rabbit has a certain fertility, but the conception rate is very low, and the fertility rate of one breeding is only about 30%; if When the light is increased to 5 watts per square meter and the light is 12 hours, the fertility rate of one breeding can reach 50%. Under the same illumination intensity for 16 hours, the female rabbit's fertility rate can reach 65% to 70%, and the survival rate of the pups can also be significantly improved. Therefore, increasing the intensity and time of light can significantly improve the fertility rate of female rabbits and the survival rate of pups. According to research conducted by the French National Academy of Agricultural Sciences, light in the rabbit house is 14 to 16 hours per day, and light is not less than 4 watts per square meter, which is conducive to the normal estrus, pregnancy and childbirth of female rabbits.

Third, commodity rabbits need weak light

Continuous darkness inhibits the development of the reproductive system in young rabbits and delays sexual maturation. This effect works through the pineal gland. After the retina feels light stimulation, it regulates the activity of the nerves that dominate the pineal gland. These nerves release a transmitter and control the formation of 5-hydroxy-indole-o-methyl transfer in the pineal gland. The enzyme, which controls the synthesis of melatonin MLT. MLT is mainly synthesized in the dark, it can inhibit pituitary synthesis and release of gonadotropins; prolonged light can reduce the production of MLT, reduce its inhibition of gonadotropin secretion, thus affecting reproductive function. In production, the spring-born puppies are exposed to an environment where the sunshine duration is prolonged and the light intensity is increased after birth. The sexual maturation time is 1 to 2 years earlier than the puppies born after the fall in an environment where the sunshine duration is short and the light intensity is weak. week. As light contributes to the development of gonads, it promotes sexual maturity in rabbits. Hyperactivity affects the intake and growth, so commercial rabbits require weak light for their growth.

It was found in production practice that rabbits raised in outdoor cages were exposed to strong light for a long time and the coat gradually became thick and dull. The rabbits kept indoors are fine and shiny. This shows that strong light irradiation is not conducive to the growth of wool fibers. Therefore, commercial rabbits also need weak light to improve fur quality.

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