Background: The semen cryopreservation has an important role in the male fertility preservation. Certainly, patients who are prone to become infertile due to surgical or medical treatments such as chemo- or radiotherapy for cancer treatment. In fact, semen cryostorage seems to be the only proven method that may offer these couples a chance of having children in the future. Objectives: This study was aimed to investigate the effects of cryopreservation protocols on human sperm parameters. Methods: Sixty semen samples with range of age (19-35) years were included in this study. Sperm parameters, were assessed pre- or post-cryopreservation. Cryopreservation protocols were done using SMART medium with either 15% dimethyl sulfoxide(DMSO) or 15% glycerol alone (as control group) or supplemented with either 0.25M or 0.5M of sucrose for treated groups. Crude data were statistically analyzed. Results: Generally, the results of the present study showed that the sperm parameters were significantly deteriorated post-thawing (P<0.05) as compared to precryopreservation. Both treated groups (G2 and G3) showed best results as compared to G1 (control groups). In contrast, treated group (G2) with 0.25 M of sucrose appeared better results than the as G3 group that treated with 0.5M of sucrose. Conclusion: Sperm parameters including concentration, motility, and morphology were deteriorated after cryopreservation. Using 0.25M sucrose reduced the impact of cryopreservation.
Background: In vitro maturation (IVM) is a culture technology that enables the immature oocytes to reach metaphase II (MII). Vitrification of immature oocytes followed by in vitro maturation can offer advantages, such as to avoid the use of large doses gonadotropins and also be an alternative approach to the use of endocrine stimulation to obtain pre-ovulatory oocytes in all cycles. Objective: The objective of the study is to determine the effect of vitrification technique and several biochemical materials on outcomes of in vitro maturation. Materials and Methods: Normal and viable immature oocytes divided into two major groups including: control group and vitrification technique group. Post-thawing, each major group subdivided into four in vitro maturation (IVM) groups using SMART medium with special additives involving: (G1) group: contained gonadotropins (Gn) only, (G2) group: supplemented with Gn and sucrose (4%), (G3) group: consisted of Gn, sucrose (4%) and follicular fluid (FF) (5%), and (G4) group: contained Gn, sucrose (4%) and FF (10%).Then, assessed the results of in vitro maturation. Results: The results of in vitro maturation for control group shows non significant differences (P>0.05) among all groups. While, a significant increase (P<0.05) in percentage of IVM was achieved when compared G3 and G4 groups with G1 and G2 groups in vitrification technique. Therefore, comparison the results of IVM between control group vitrification technique group appeared a significant difference (P<0.05) in G1 groups and also between G2 groups. However, non significant difference (P>0.05) was appeared between G3 groups and also between G4 groups when comparing between control group and vitrification technique group. Conclusions: Vitrification of immature oocytes were appeared as a promise technique for preservation of oocytes. As well as, the addition of follicular fluid (FF) to maturation medium produced the best results for in vitro maturation (IVM).
Background: Oocyte vitrification is a promising technique. The choice of appropriate types and concentrations of cryoprotectants is essential for the success of the oocytes vitrification. Objective: This study aimed to investigate the effect of vitrification on viability and morphology of oocytes and to compare the effect of several cryoprotectants on the viability and morphology of oocytes during vitrification and post-thawing. Methods: The sheep ovaries were collected from the local abattoir. Only normal and viable oocytes were included in this study. By using cryotop, immature oocytes that were viable with normal morphology were vitrified with 15% DMSO and 15% EG supplemented with 0.0 M, 0.25M, or 0.5 M of either sucrose or trehalose as control and treated groups. Oocytes viability and morphology were assessed post-aspiration and post-thawing. Results: Fromthe results of the present study, the percentage of post-thawing normal and viable oocyte reported with the use of 0.5M trehalose and EG in vitrification solution (VS) significantly)P<0.05) higher than the percentage of post-thawing normal and viable oocyte reported with use of 0.25 M trehalose and EG. Conclusion: Vitrification is simple technique and easy to perform but it needs some experience to prevent any oocyte loss during vitrification and thawing processing. The use of 0.5 M of either sucrose or trehalose in vitrification solution improves the percentage of post-thawing viable and normal oocytes.