2Renaville R.,Burny A..Biotechnology in Animal Husbandry[M].The Netherlands:Kluwer Academic Publishers,2000.
3Armstrong DT..Factors affecting superovulation success[J].Embryo Transfer Newsletter,1991,(9):11 - 17.
4Baril F.,Khalid M.,Haresign W.,et al.Factors affecting the survival of sheep embryos after transfer within a MOET Program[J].Theriogenology,2003 (59):1265 - 1275.
2CROSS J C, WERB Z, FISHER S J. Implantation and the placenta key pieces of the development puzzle [ J]. Science, 1994, 266: 1508 - 1518.
3ZHUANG G L. Modem technology of delivery assistant[M]. Beijing: Peoples Medical Published House, 2005:165 -166.
4ARMSTRON D T. Factors affecting superovulation success[J]. Embryo Transfer New sletter,1991 (9) :11 -17.
5JOHNSON G A, STEWART M D, GRAY C A,et al. Effects of the estrous cycle pregnancy and interferon tauon 2' , 5 ' oligoadeny late synthetase expression in the ovine uterus [ J]. Biol Reprod,2001, 64 : 1392 - 1399.
6CHOI Y, JOHNSON G A, BERGHARD R C, et al. lerferen regulatory factor two restricts expression of irferon stimulated genes to the endomet stroma and glandular epithelium of the ovine uterus [ J ]. Biol Repred,2001,65 :1038 - 1049.
