1State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, CAAS, Lanzhou, Gansu Province 730046, People’s Republic of China.
2Animal Reproduction Institute, Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization, Guangxi University, Nanning, Guangxi Zhuang Autonomous Region 530005, People’s Republic of China.
3College of Animal Sciences, South China Agricultural University, Guangzhou, Guangdong Province 510642, People’s Republic of China.
4College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province 510642, People’s Republic of China.
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