1. Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology; Northwest A&F University; Yangling Shaanxi P. R. China
2. College of Life Sciences; Zhejiang Sci-Tech University; Hangzhou P. R. China
3. College of Animal Science and Technology; Henan University of Animal Husbandry and Economy; Zhengzhou Henan P. R. China
4. Mammalian NutriPhysioGenomics, Department of Animal Sciences and Division of Nutritional Sciences; University of IIlinois; Urbana Illinois