1 Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production, Changsha, Hunan 410125, China.
2 University of Chinese Academy of Sciences, Beijing 100039, China.
3 CSIRO Food and Nutrition, Canberra, ACT, Australia.
4 North Carolina State University, Raleigh, NC, USA.