[Liu, Jing-Cai; Lai, Fang-Nong; Zhao, Yong; Shen, Wei; Li, Lan; Cheng, Shun-Feng] Qingdao Agr Univ, Inst Reprod Sci, Coll Anim Sci & Technol, Qingdao 266109, Peoples R China.
[Li, Ling] Tengzhou Peoples Hosp, Tengzhou 277500, Peoples R China.
[Li, Bo] Chengguo Stn Anim Husb & Vet, Laizhou 261437, Peoples R China.
[Zhang, Xi-Feng] Wuhan Polytech Univ, Coll Biol & Pharmaceut Engn, Wuhan 430023, Hubei, Peoples R China.