Human Reproduction, Vol. 15, No. 2, 395-401,
February 2000
© 2000 European Society of Human Reproduction and Embryology
A single medium supports development of bovine embryos throughout maturation, fertilization and culture
1 Department of Animal Sciences, Purdue University, West Lafayette, IN 47907 and 2 Colorado Center for Reproductive Medicine, Englewood, CO 80110, USA
Oocytes and embryos are typically exposed sequentially to varying culture media in standard in-vitro protocols. Expenditures of energy may be required following each medium change to adjust to the changing environment. Therefore, a single base medium was evaluated for its ability to support in-vitro maturation, fertilization and pre-implantation development (IVM/F/C) of bovine oocytes and embryos. Four treatments were examined: a standard maturation [tissue culture medium (TCM) 199 with bovine calf serum (BCS)], fertilization (modified Tyrode's medium with albumin, lactate and pyruvate) and culture (hamster embryo culture medium/TCM with BCS) system (control) and three synthetic oviductal fluid (SOF) treatments; maturation in SOF with bovine serum albumin (SOFBSA), SOF with bovine calf serum (SOFBCS) or the control maturation medium (TCM199 with BCS; SOF199), followed by fertilization and culture in SOF medium. The percentage of total inseminated oocytes successfully developing to the morula and blastocyst stage did not differ (P > 0.05) between treatments (control, 30.5 ± 3.5; SOFBSA, 24.6 ± 3.2; SOFBCS, 22.4 ± 4.7; SOF199, 27.3 ± 3.2). Embryos cultured in SOFBCS (92.1 ± 6.4) had significantly higher cell numbers (P < 0.05) than those cultured in control (74.8 ± 4.8) and SOFBSA (71.6 ± 6.6) but not SOF199 (81.2 ± 6.8). In conclusion, a single medium can be used successfully throughout maturation, fertilization and pre-implantation embryo development. Moreover, inclusion of serum during maturation in the single medium system resulted in significantly greater cell numbers, possibly reflecting increased quality of the embryos produced.
Key words: bovine/culture medium/embryo culture/in-vitro fertilization/oocyte maturation
3 To whom correspondence should be addressed at: Department of Animal Sciences, Purdue University, 1151 Lilly Hall, West Lafayette, IN 47907-1151, USA
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