1. Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou, People’s Republic of China
2. Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, People’s Republic of China
3. Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana, IL, USA