Yang Zaiheng checks the quality of a duck egg at an egg-laying duck farm in Dingdong Village of Danzhai County, Qiandongnan Miao and Dong Autonomous Prefecture, southwest China's Guizhou Province, Dec. 4, 2018. Duck farmer Yang Zaiheng, 42, was once impoverished. After getting rid of poverty in 2015 through livestock and fish farming, Yang decided to promote the breeding industry in local area and help other impoverished households increase income. In 2017, Yang and other six households set up an egg-laying duck breeding cooperative with a duck egg production of over 800,000 every year. (Xinhua/Yang Wukui)