1. Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Northwest University, xi'an, Shannxi, 710069, P.R.China
2. Department of Life Sciences, Yuncheng University, Yuncheng, Shanxi, 044000 P.R.China
3. Centre of Biological and Chemical Exiperiment, Yuncheng University, Yuncheng, Shanxi 044000, China
4. Department of Animal Science and Technology, Nanjing Agriculture University, Nanjing, Jiangshu 210095, China
5. Enzyme Engineering Institute of Shaanxi, Academy of Sciences, Xi'an Shaanxi, 710600 P.R.China