1. Chinese Acad. Sci., Inst. Subtrop. Agric., Res. Ctr. Healthy Breeding Livestock & Poultry, Hunan Eng. & Res. Ctr. Anim. & Poultry Sci., Key Lab Agroecol. Proc. Subtrop. Reg., Scientific Observation and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Changsha City, Hunan, 410125, P. R. China
2. University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
3. Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang, Guangxi, 547100, P. R. China
4. Food Research Centre, Agriculture and Agri-Food Canada, Guelph, Ontario N1G 5C9, Canada
5. Department of Animal Science, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada