5[2]Lopez-Gatius F.Site of semen deposition in cattle:a review[J].Theriogenology,2000,53:1407-1414.
6[3]Lopez-Gatius F,Camon-Urgel J.Effect of side of insemination on transuterine transport of spermatozoa in superovulated dairy cattle [J].Theriogenology,1988,29:1099-1103.
7[4]Senger P L,Becker W C,Davidge S T et al.Influence of corneal insemination on conception in dairy cattle [J].J.Anim.Sci.,1988,66:3010-3016.
8[5]Perkins J R,Olds D,Seath DM.A study of 1000 bovine genitalia [J].J.Dairy Sci.,1954,37:1158-1163.
9[6]Lopez-Gatius F.Transuterine sperm transport is not affected by bilateral asymmetry of the reproductive system in dairy cows [J].Theriogenology,1997,47:1319-1325.
10[7]Dalton J C,Nadir S,Bame JH et al.Effect of a deep uterine insemination on spermatozoal accessibility to the ovum in cattle:a competitive insemination study [J].Theriogenology,1999,51:888-890.
