[1] State Key Lab Swine & Poultry Breeding Ind, Guangzhou 510640, Peoples R China
[2] Guangdong Acad Agr Sci, Inst Anim Sci, Guangzhou 510640, Peoples R China
[3] Minist Agr & Rural Affairs, Key Lab Anim Nutr & Feed Sci South China, Guangzhou 510640, Peoples R China
[4] Guangdong Prov Key Lab Anim Breeding & Nutr, Guangzhou 510640, Peoples R China
[5] Guizhou Univ, Key Lab Anim Genet Breeding & Reprod Plateau Mt Re, Minist Educ, Coll Anim Sci, Guiyang 550025, Peoples R China