Jiyu Liu, master of Preventive veterinary Medicine, national licensed veterinarian. At present, Dr. Liu is the deputy general manager of pig Business Department of Huan Shan Group Co., Ltd. and in charge of breeding, equipment management, and production technology. After graduation, he was engaged in pig production, pig health management and other related work. He was responsible for the production and technical management of modern pig farms of different sizes, including 2400 sows, 6200 sows and 9800 sows, and other large-scale pig farms. He has participated in on-site production practice and health management practice training on pig farms twice in the United States. Based on the experience of pig production management, he has published 18 literatures (two English literatures), edited two books (one as an associate editor), applied eight utility model patents (two patents granted), participated in five projects from country, province, city, respectively. At the same time, he served as the deputy secretary general of Shandong Provincial Veterinary Association, member and executive director of Shandong Provincial Animal Husbandry Association Pig Branch Group, master of Weihai Comprehensive Test Station of Shandong Pig Industry Technology System, member of Pig Industry Standardization Working Group of National Animal Husbandry Standardization Technical Committee, industry tutor of Shandong Animal Husbandry and Veterinary Vocational College, instructor of teaching practice base and editorial board member of "Swine Science" magazine, etc.