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Effect of Mifepristone, Sericin and Taurine in Tris Extender on Oxidative Markers and Quality of Fresh and Frozen-Thawed Bovine Spermatozoa

Devangana Chaturvedi, Arjun J Dhami, Dinesh V Chaudhari, Mohsin M Pathan.

Abstract
This study was carried out on semen of 3 Gir and 3 Murrah bulls. Semen ejaculates with >75 % initial motility (n=7 per • 21/breed; total 42) were split-diluted at 100 million sperm per ml using Tris-citric acid-fructose-egg yolk-glycerol (TFYG) extender without and with Mifepristone (10 g/ml), Sericin (5 mg/ml) and Taurine (4 mg/ml) as additives. French mini straws were filled and sealed using IS4 system, and frozen in liquid nitrogen vapour using a programmable biofreezer after 4 hrs of equilibration. The straws were thawed in water bath at 37C for 30 sec. The overall mean per cent sperm motility observed in freshly diluted and frozen-thawed semen, irrespective of antioxidants, were 83.570.51 and 46.730.67 in Gir, and 83.150.54 and 48.810.82 in Murrah bulls, respectively. The corresponding per cent capacitated sperm (B+AR pattern) in chlortetracycline (CTC) fluorescence assay were 17.770.53 and 34.440.95 in Gir, and 18.000.51 and 31.200.82 in Murrah bulls. The mean seminal plasma MDA (mol/ml) activity on dilution and at post-thaw stage were 18.830.25 and 20.590.28 for Gir, and 19.320.26 and 21.760.31 for Murrah bulls, respectively. The corresponding means for SOD (U/ml) were 2.940.05 and 2.450.03 for Gir, and 2.350.06 and 1.970.05 for Murrah bulls, and the GPx (nmol/min/ml) 493.858.31 and 438.87 8.13 for Gir, and 508.828.71 and 452.838.20 for Murrah bulls, respectively. All the parameters differed significantly between stages and between extender-additives. MDA activity and capacitated sperm were significantly (p

Key words: Antioxidant Sericin, Mifepristone, Taurine, Bovine semen, Cryopreservation, Oxidative markers, Sperm motility, Cryocapacitation



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