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Partial deoxygenation of extender improves sperm quality, reduces lipid peroxidation and reactive oxygen species during cryopreservation of buffalo (Bubalus bubalis) semen. 2018

B Balamurugan, and S K Ghosh, and S A Lone, and J K Prasad, and G K Das, and R Katiyar, and Abdul Rahman Mustapha, and Ajay Kumar, and M R Verma
Division of Animal Reproduction, ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar Pradesh, 243122, India.

The present study was designed to investigate the effect of partial deoxygenation of extender on sperm quality, lipid peroxidation (LPO) and reactive oxygen species (ROS) in buffalo (Bubalus bubalis) during cryopreservation of semen. Semen extender was prepared freshly and split into three sub-extenders [Extender I: control (non-deoxygenated), Extender II (partially deoxygenated by using LN2 flushing) and Extender III (partially deoxygenated mechanically by vacuum pump)]. Amounts of dissolved oxygen (DO) were determined in all the three extenders and also in post-thaw semen. Ejaculates with mass motility of  ≥3+ and individual progressive motility of 70% or greater were collected from Murrah buffalo bulls and utilized in the study. Each semen sample was divided into Groups I (diluted with Extender I), II (diluted with Extender II) and III (diluted Extender III) with a maximum of 60 × 106 sperm/mL. French mini straws (0.25 mL) were filled with the extended semen samples, sealed with polyvinyl alcohol powder, kept for 3 h at 5 °C for equilibration and then stored in an automatic programmable freezer until the temperature of straws reached -145 °C followed by plunging the straws into liquid nitrogen (-196 °C). Semen samples were evaluated at pre-freeze and post-thaw stages for various variables [sperm motility, live sperm count, acrosomal integrity, hypo-osmotic swelling (HOS) response, LPO and ROS concentrations]. The mean DO was less (P < 0.05) in Extender II as compared to I and III. The DO was less (P < 0.05) in Group II (semen extended with Extender II) as compared with III (semen extended with Extender III) and I (semen extended with Extender I). The percentages for sperm motility, viability and intact acrosomes (PIA) were greater (P < 0.05) in Groups II and III as compared to the control group at the pre-freeze stage, while at the post-thaw stage, percentages of sperm motility, viability, PIA and HOS response were greater (P < 0.05) in Group II as compared with the control group and Group III. Pre-freeze HOS response (%) was greater (P < 0.05) in Group II as compared with the control and Group III. At the pre-freeze stage, sperm LPO and ROS were less (P < 0.05) in Groups II and III as compared with the control and at post-thaw stage, spermatic LPO and ROS concentrations were less (P < 0.05) in Group II than in the control group and Group III. In conclusion, partial deoxygenation of extender improves sperm quality, reduces sperm LPO and ROS concentrations in buffalo during cryopreservation. Partial deoxygenation of the extender with LN2 flushing may be one of the ways for improving quality and fertility of frozen-thawed buffalo sperm.

UI MeSH Term Description Entries
D008297 Male Males
D002020 Buffaloes Ruminants of the family Bovidae consisting of Bubalus arnee and Syncerus caffer. This concept is differentiated from BISON, which refers to Bison bison and Bison bonasus. Bubalus,Syncerus,Water Buffaloes,Buffalo,Water Buffalo,Buffalo, Water
D003451 Cryoprotective Agents Substances that provide protection against the harmful effects of freezing temperatures. Cryoprotective Agent,Cryoprotective Effect,Cryoprotective Effects,Agent, Cryoprotective,Agents, Cryoprotective,Effect, Cryoprotective,Effects, Cryoprotective
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012661 Semen The thick, yellowish-white, viscid fluid secretion of male reproductive organs discharged upon ejaculation. In addition to reproductive organ secretions, it contains SPERMATOZOA and their nutrient plasma. Seminal Plasma,Plasma, Seminal
D012662 Semen Preservation The process by which semen is kept viable outside of the organism from which it was derived (i.e., kept from decay by means of a chemical agent, cooling, or a fluid substitute that mimics the natural state within the organism). Frozen Semen,Sperm Preservation,Preservation, Semen,Preservation, Sperm,Semen, Frozen
D015227 Lipid Peroxidation Peroxidase catalyzed oxidation of lipids using hydrogen peroxide as an electron acceptor. Lipid Peroxidations,Peroxidation, Lipid,Peroxidations, Lipid
D015925 Cryopreservation Preservation of cells, tissues, organs, or embryos by freezing. In histological preparations, cryopreservation or cryofixation is used to maintain the existing form, structure, and chemical composition of all the constituent elements of the specimens. Cryofixation,Cryonic Suspension,Cryonic Suspensions,Suspension, Cryonic
D017382 Reactive Oxygen Species Molecules or ions formed by the incomplete one-electron reduction of oxygen. These reactive oxygen intermediates include SINGLET OXYGEN; SUPEROXIDES; PEROXIDES; HYDROXYL RADICAL; and HYPOCHLOROUS ACID. They contribute to the microbicidal activity of PHAGOCYTES, regulation of SIGNAL TRANSDUCTION and GENE EXPRESSION, and the oxidative damage to NUCLEIC ACIDS; PROTEINS; and LIPIDS. Active Oxygen Species,Oxygen Radical,Oxygen Radicals,Pro-Oxidant,Reactive Oxygen Intermediates,Active Oxygen,Oxygen Species, Reactive,Pro-Oxidants,Oxygen, Active,Pro Oxidant,Pro Oxidants,Radical, Oxygen
D055101 Semen Analysis The quality of SEMEN, an indicator of male fertility, can be determined by semen volume, pH, sperm concentration (SPERM COUNT), total sperm number, sperm viability, sperm vigor (SPERM MOTILITY), normal sperm morphology, ACROSOME integrity, and the concentration of WHITE BLOOD CELLS. Semen Quality,Semen Quality Analysis,Analyses, Semen Quality,Analysis, Semen Quality,Qualities, Semen,Quality Analyses, Semen,Quality, Semen,Semen Analyses,Semen Qualities,Semen Quality Analyses

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