Standard varieties are the product of human life and production activities. Early poultry breeding is in the stage of experience breeding. Humans mainly choose the quality characters such as body shape, appearance and feather color of the poultry, and consider less about the production character, creating many standard varieties with uniform blood and typical appearance characteristics. However, with the rise of commercial poultry production, the focus of breeding has shifted to production performance. After continuous development, a small number of standard varieties have become commercial accessories. Supporting systems are based on standard varieties and cultivated using modern methods of breeding. They have high-yield groups with specific commercial codes, also known as commercial products. Supporting systems and standard varieties are two different concepts. The standard variety is the product of the experience breeding stage, emphasizing the characteristics of the variety; and the matching system is the crystallization of modern breeding. It is a specific strain selected based on the requirements of the production performance and is the inheritance and development of the standard variety. Egg chicken standard varieties White-winged flying chicken is a light-white shell laying hen, which is small in size and delicate in appearance. It has white feathers, a single crown, and a bright red crown. The cock is upright and the hen is turned to a case. Cockroaches, ticks, and skin are yellow, and the ear is white. White-flying chickens have long sexual maturity, high egg production, white egg shells, and low feed consumption. They are currently the main chicken species used in the production of commercial laying hens worldwide. Luodao red chicken, dark red feathers, tail feathers near black. Body is slightly rectangular, medium to large head, single crown, yellowish brown, yellow. Crowns, ears, flesh and face are bright red, yellow skin, medium size, high egg production, heavy egg weight, brown shell. Currently widely used in the production of brown shell layer chickens, used as a cross-parent line. Main types of modern layer chicken commercial varieties Modern white shell chickens are all derived from single crowned white hawks, and they produce two-line, three-line or four-line hybrid hens by breeding different pure lines. General use of companion fast and slow feather genes in the commercial generation to achieve chicks from other male and female. The main supporting mode of brown shell layer chickens is Luodaohong as the paternal line, Luodaobai or Bai Locke and other species with silver genes associated with them as the maternal line. When the horizontal spot gene was used for self-determination, the Luodaohong or other non-barrel-type plume was used as the paternal line, and the horizontal spot-locked line was used as the maternal line for the commercial generation of the brown-shelled layer. The light brown shell layer chicken is a chicken species produced by crossing the light white chicken with the medium brown shell layer chicken. It mainly uses the Luodao red type chicken as a paternal line and hybridizes with the white female model. It uses the companion fast and slow plume gene to distinguish between male and female. . Medical Sterilizer,Medical Steam Sterilizer,Medical Device Sterilization,Steam Sterilizer For Surgical Instruments ZHEJIANG FOMOS MEDICAL TECHNOLOGY CO.,LTD. , https://www.ifomos.com