1. Department of Veterinary Medicine College of Veterinary Medicine, Northeast Agricultural University Harbin China
2. Institution of Animal Science, Chinese Academy of Agricultural Sciences, Scientific Observing and Experiment Station of Animal Genetic Resources and Nutrition in North China, Ministry of Agriculture Beijing China
3. Key Laboratory of the Provincial Education Department of Heilongjiang for Common Animal Disease Prevention and Treatment, Department of Veterinary Medicine, Northeast Agricultural University Harbin China
4. Key Laboratory of Animal Cellular and Genetic Engineering of Heilongjiang Province Harbin PR, China