Guanzhong Donkey
It is produced in the counties of the Weihe River Basin in Guanzhong Plain, Shaanxi Province, with Xianyang, Pingguan Wugong, Qianxian and Liquan as the central producing areas. This kind of donkey is tall, more than 1.30 meters tall, weighs 250-290 kilograms, has a strong physique, small and solid hooves, strong disease resistance, good heredity and strong persistence. The hair color of Guanzhong donkey is mainly black, but the rims of eyes, nose, mouth and lower abdomen are mostly white or gray, so it is called "pink nose, bright eyes and white belly". This is not only the characteristic of Guanzhong donkey, but also a necessary condition for donkey breeding. Guanzhong donkey is not only the generation of donkey breeds in China, but also one of the best breeds in the world. There are now more than 100,000 horses.
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How to control the occurrence of silkworm disease
Through practical investigation, we found that in the process of silkworm rearing at home, silkworm farmers' lack of understanding of the harm of silkworm disease often led to the occurrence of silkworm disease, resulting in serious losses to production. Therefore, how to control the occurrence of silkworm disease is always the primary task in sericulture production. 1. The cause of silkworm disease is that sericulture is a high-density group rearing mode. There are many silkworm heads in a certain area, and silkworm eats mulberry and excreta in the same area. Once disinfection is negligent, or improper feeding and management, infectious silkworm disease is easy to occur, resulting in spread,
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General situation of research and utilization of propolis
Propolis is a kind of colloidal substance which is collected by bees from buds and bark of plants and mixed with glandular secretions such as tongue glands and wax glands of honeybees. Propolis is an opaque solid, brownish brown, reddish brown or grayish brown, sometimes with turquoise, a few nearly black. Natural fresh propolis has resin flavor, stickiness and plasticity. It begins to soften at 36 ℃, hardens and becomes brittle at 15 ℃, and melts into a viscous liquid at 60-70 ℃. Propolis is a kind of resin, which is easily soluble in ether, chloroform, acetone,
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