2[2]Lopez-Gatius F.Site of semen deposition in cattle:a review[J].Theriogenology,2000,53:1407-1414.
3[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.
4[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.
5[5]Perkins J R,Olds D,Seath DM.A study of 1000 bovine genitalia [J].J.Dairy Sci.,1954,37:1158-1163.
6[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.
7[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.
8[8]Dominko T,First N L.Relationship between the maturational state of oocytes at the time of insemination and sex ratio of subsequent early bovine embryos [J]:Theriogenology,1997,47:1041-1050.
9[9]Martinez F,Kaabi M,Martinez-Pastor F et al.Effect of the interval between estrus onset and artificial insemination on sex ratio and fertility in cattle:a field study [J].Theriogenology,2004,62:1264-1270.
10[10]Wehner G R,Wood C,Tague A et al.Efficiency of the ovatec unit for estrus detection and calf sex control in beef cows [J].Anim.Reprod.Sci.,1997,46:27-34.