1 Chongqing Key Laboratory of Forage and Herbivorce, College of Veterinary Medicine, Southwest University, Chongqing, China.
2 Key Laboratory for Bio-Resource and Eco-Environment of Education of Ministry, The Center for Growth, Metabolism and Aging, College of Life Sciences, Sichuan University, Chengdu, China.
3 Chongqing Academy of Animal Science, Chongqing, China.