1. Key Laboratory of Efficient Utilization of Non-grain Feed Resources, Department of Animal Science, Shandong Agricultural University , Taian, Shandong 271000 . China
2. Precision Livestock and Nutrition Unit, Gembloux Agro-Bio Tech, University of Liège , Gembloux 5030 , Belgium
3. Nutrition and Animal Microbiota Ecosystems lab, Department of Biosystems, KU Leuven , Leuven 3000 , Belgium