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Development and viability of bovine embryos derived from oocytes matured and fertilized in vitro and co-cultured with bovine oviducal epithelial cells

Summary. A co-culture system using a suspension of detached bovine oviducal epithelial cells (BOEC) has been developed as an effective culture method for supporting the development of bovine embryos derived from oocytes matured and fertilized in vitro. Four commercially available culture media (Waymouth's, Ham's F-10, TCM 199 and Ménézo's B2) supplemented with 10% oestrous cow serum, and a modified Tyrode's medium (TALP) supplemented with 0·6% bovine serum albumin were used. Ménézo's B2 resulted in the highest percentages of total uncleaved presumptive zygotes, and of the cleaved zygotes that reached at least the morula stage (31–46% and 66–74%, respectively). The embryos produced in vitro in B2 with BOEC resembled embryos produced in vivo with regard to numbers of cells (averaging 45·4 in morulae, 101·5 in blastocysts, 174·7 in hatching blastocysts and 195·9 in hatched blastocysts), rate of development (hatching on Day 8–9 of culture in vitro), rate of hatching (66% of cleaved zygotes) and pregnancy rates (63%) resulting from the transcervical transfer of selected embryos.

Keywords: oviduct cells; embryo; viability; cattle

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