1. College of Animal Science and Technology, Chongqing Key Laboratory of Forage & Herbivore, Chongqing Engineering Research Center for Herbivores Resource Protection and Utilization, Southwest University, Beibei, 400715 Chongqing, P. R. China
2. ChongQing Academy of Animal Sciences, Rongchang, 402460 Chongqing, P. R. China
3. College of Animal Science, Southwest University, Rongchang Campus, Rongchang, 402460 Chongqing, P.R. China
4. Chongqing Institute of Medicinal Plant Cultivation, Nanchuan, 408435 Chongqing, P.R. China