Affiliation: | 1. College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, Shaanxi, China 2. Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN, 37996-4542, USA 3. Department of Obstetrics and Gynecology, Graduate School of Medicine, University of Tennessee, Knoxville, TN, 37920, USA
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