Japanese scientists reported in the latest issue of the British magazine Nature that the animals that breed in the spring, such as quail, will have their spring glands spread to the brain according to the characteristics of the spring time. ready. In the experiment, Yoshimura Chong, an associate professor at Nagoya University in Japan, adjusted the lighting time for the cranes, first with a short illumination time and the same as the winter, and then gradually extending the illumination time to a state equivalent to the spring. During this process, scientists closely observed changes in the infratemporal thalamus. The hypothalamus is a higher central nervous system that regulates visceral and endocrine activities under the cerebral cortex. The study found that when the light is extended to the spring state, the bulging part of the pituitary below the hypothalamus begins to secrete thyroid stimulating hormone. After the hormone transmits information to a specific area of ​​the brain, it can promote a gene that can activate the development of the gonad. Yoshimura said that the mechanism that senses the arrival of spring is common in vertebrate animals. If thyroid hormones can be adjusted to control the breeding time, it is possible to increase the reproductive capacity of livestock and fish. Traditional
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The length of light affects the breeding season