1. Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
2. Zhanjiang Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang 524013, China
3. Department of Poultry Production, Faculty of Agriculture, Assiut University, Assiut 71526, Egypt
4. Hainan Yitian Biotechnology Co., Ltd., Haikou 570228, China
5. Tianjin Ninghe Original Pig Farm Co., Ltd., Tianjin 301500, China