亚洲一区欧美在线,日韩欧美视频免费观看,色戒的三场床戏分别是在几段,欧美日韩国产在线人成

An innovative area is forming rapidly with the application of LED (light emitting diode) light sources in the intensive production of poultry which has a highly developed visual system. Firstly, the article reviewed the advancement on LED light environment control technology for intensive poultry production. For broilers, the optimization of LED light color, intensity and photoperiod could improve the structure of small intestinal mucosal and consequently enhance the feed utilization and growth rate. The light environment could also affect the satellite cell proliferation, muscle fiber development and behavior activities to meliorate the carcass characteristic, meat quality and the health, which helped to strengthen the immunity, reduce the mortality and disease incidence. For laying hens and breeders, the light conditions could promote the sex maturity, age at first egg and lay rate by increasing the release of luteinizing hormone and follicle stimulating hormone. Besides, the egg quality, pecking, fertility and hatchability of breeders were improved by providing suitable lights. Finally, the development trends of LED light environment control for intensive poultry production were presented by the analysis of current status and issues.