Chengjian Guo, Master of Veterinary Medicine, Technical Director of  Vetoquinol–Ascor. His expertise covers pig herd disease prevention and control, boar stud management, and sow herd reproductive management. He mainly provides technical support and training to large-scale pig enterprises, helping farms standardize their operations, optimize production processes, diagnose on-farm problems, and develop solutions. He previously served as a farm veterinarian and farm manager, giving him a thorough grasp of every stage of the production process and systematic, well-rounded experience in swine disease prevention and control. He also worked as a technical service manager at a feed company, gaining familiarity with the nutritional requirements and feeding management of pigs at all stages. In recent years, his primary focus has been on researching and promoting single fixed-time insemination (FTI) in pigs, gilt development, and boar stud management.