Affiliation: | 1Guangxi Key Laboratory of Livestock Genetic Improvement, Guangxi Institute of Animal Sciences, Nanning, Guangxi, P. R. China;2Hebei Research Institute for Family Planning, Shijiazhang, Hebei, P. R. China;3Hormel Institute, University of Minnesota, Austin, Minnesota, United States of America;Peiking University Third Hospital, CHINA |