Liu Ling, Ph.D., graduated from College of Animal Science and Technology, China Agricultural University in 2010. Now, he is working at China Agricultural University, focusing on the research area of swine feed ingredient evaluation and swine nutrition requirements. He has worked in this area for more than 10 years and has evaluated more than 100 kinds of swine feed ingredients. He has published more than 50 papers, and has written the chapter “Feed composition and nutritive value” in the book “Nutrition Requirements of Swine in China”, and the chapter “Feed composition and nutritive value” in the National Standard “Nutrition Requirements of Swine” (GB/T 39235-2020). His research results have been applied in many feed and pig companies.