title: In vitro-matured/in vitro-fertilized bovine oocytes can develop into morulae/blastocysts in chemically defined, protein-free culture media.
abstract: Development of bovine embryos derived from in vitro-matured/in vitro-fertilized (IVM/IVF) oocytes was examined in two culture media: hamster embryo culture medium (HECM), a relatively simple, chemically defined, protein-free medium containing 20 amino acids; and tissue culture medium (TCM)-199, a more complex medium designed for culture of somatic cells. The first experiment studied (1) effects of glucose and/or phosphate (Pi) using HECM and (2) the development of bovine IVM/IVF embryos in four different conditions: HECM, TCM-199, TCM-199 + 10% unheated bovine calf serum (BCS), and oviduct cell-conditioned TCM-199 + 10% BCS. After IVF, 45% of the inseminated oocytes developed to the morula/blastocyst stages (M&B) when cultured in HECM; blastocyst development was depressed in the presence of glucose and Pi when compared to Pi alone. When the four culture conditions were compared, there was no significant difference in M&B development (42-51% of inseminated oocytes). However, blastocyst development in TCM-199 supplemented with 10% BCS (29.7%) or with BCS + oviduct cell-conditioned medium (21.6%) was significantly greater than in nonsupplemented HECM (9.7%) or TCM-199 (13.8%). In the second experiment, the effects of serum supplementation and/or oviduct cell conditioning on HECM and TCM-199 were examined in a 2 x 2 x 2 factorial experiment. Oviduct cell conditioning of either HECM or TCM-199 without serum supplementation did not enhance bovine embryo development. Serum supplementation exhibited a biphasic effect, with inhibition at the first cleavage and stimulation of morula compaction and blastocyst formation.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Veterinary Science, University of Wisconsin-Madison 53706.
authors.forename: T
authors.initials: T
authors.lastname: Pinyopummintr
authors.forename: B D
authors.initials: BD
authors.lastname: Bavister
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000502:physiology*; D001769:Blood; D002417:Cattle / Q000196:embryology*; D003470:Culture Media; D046508:Culture Techniques; D005314:Embryonic and Fetal Development; D005260:Female; D005307:Fertilization in Vitro; D009028:Morula / Q000502:physiology*; D009865:Oocytes / Q000502:physiology
chemical_list: D003470:Culture Media