Effects of alfalfa hay with high trace element content on growth performance of Dorper sheep

• Xiao Guo-, 
• Xiao-Lei GE, 
• Shi-Tong-La-Ge HA, 
• Shi-Liang LIU, 
• Dang-Ling HUA, 
• LIU Fang, 
• Hua-Feng HU, 
• Jin-Shuai XIAO