Volume 3, Issue 1 (7-2005)                   IJRM 2005, 3(1): 36-41 | Back to browse issues page

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Rezaei N, Chian R. Effects of essential and non-essential amino acids on in-vitro maturation, fertilization and development of immature bovine oocytes. IJRM 2005; 3 (1) :36-41
URL: http://ijrm.ir/article-1-30-en.html
Abstract:   (3019 Views)
Background: Addition of amino acids to the culture medium is beneficial for embryonic development in many species. Objective: The objective of this study was to investigate the effects of amino acids on the in vitro maturation and embryonic development of the bovine oocyte. Materials and Methods: Bovine ovaries were collected from a local abattoir and brought into laboratory. Cumulus-oocyte complexes (COCs; n=1212) were aspirated from follicles (2-8 mm in diameter) and randomly assigned to four groups for maturation in culture: (1) Basic medium alone as control; (2) Basic medium supplemented with 2% MEM essential amino acids solution; (3) Basic medium supplemented with 1% MEM non-essential amino acids solution; and (4) Basic medium supplemented with 2% MEM essential amino acids solution + 1% MEM non-essential amino acids solution. COCs were incubated in 1 ml maturation medium in an Organ culture dish at 38.5�C in an atmosphere of 5% CO2 with high humidity. After 24 h of culture, 372 oocytes were fixed to determine maturation rate and the remaining oocytes were used for in vitro fertilization (IVF). Following 18 h of insemination, 437 oocytes were fixed and examined for fertilization and 403 oocytes were further cultured. Results: There were no differences in maturation rates and penetration rates among the four groups. Although oocyte cleavage rates were not different in the four groups, embryo development up to the 8-cell stage and blastocyst were significantly higher (p<0.05) in Group (2) and (4) than in the Control and Group (3). Conclusion: These results indicate that the presence of amino acids, especially essential amino acids in the maturation medium is beneficial to oocyte cytoplasmic maturation and subsequent early embryo development in vitro.
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