Filtration techniques are advantageous over colloidal centrifugation in improving freezability of low-quality buffalo bull ( Bubalus bubalis ) ejaculates.

The study compared efficacy of three sperm selection techniques in improving freezability of low-quality Murrah buffalo bull ejaculates. Sephadex (SEP), Sephadex ion-exchange filtration (SIE), and 40/80% gradient centrifugation protocols were standardized (ejaculates, =24). In Experiment-I, Sephadex G-75, G-100, and combined Sephadex G (75-100) column filtrates were compared. In Experiment-II, protocols: 200g-10min, 250g-5, and 10min, 300g-10, and 15min were compared. In fresh semen, Sephadex G (75-100) filtration and 250g-5min protocol improved sperm functions and were used in Experiment-III, where SEP G (75-100), SIE G (75-100), and 250g-5min processed ejaculates (=48) were cryopreserved and compared at post-thaw stage. The mean recovery rate differed in order: SEP > SIE > . SIE filtration significantly improved progressive motility, livability, membrane integrity, bovine cervical mucus penetration and live non-apoptotic sperm. Compared with control, all three techniques equally reduced post-dilution and post-thaw lipid peroxidation (LPO) rate. SEP post-thaw filtrates observed lower cryocapacitation-like changes, LPO (C-BODIPY), and higher active mitochondria than other treatments. SIE and SEP equally improved post-thaw acrosome-intact sperm over . Filtration techniques, preferably, Sephadex ion-exchange filtration can most efficiently process low-quality buffalo bull ejaculates for cryopreservation and improve freezability.