Comparing ethylene glycol with glycerol for cryopreservation of buffalo bull semen in egg-yolk containing extenders

The objective of this work was to evaluate the possibility of substituting glycerol for ethylene glycol when cryopreserving buffalo semen. Semen of eight buffalo bulls was mixed, pooled, and frozen in one of these four diluents: centrifuged Tris egg yolk glycerol; centrifuged Tris egg yolk ethylene glycol; centrifuged Milk egg yolk glycerol; or centrifuged Milk egg yolk ethylene glycol. Semen quality parameters assessed after thawing were motility, survivability, livability, sperm abnormality, acrosome integrity, and plasma membrane integrity. Conception rate and pregnancy rate were calculated after insemination of 104 buffaloes by straws of different groups (26 female/extender). Improvement in livability, sperm abnormality, acrosome integrity, plasma membrane integrity, conception rate, and pregnancy rate were seen when using ethylene glycol to replace glycerol when freezing buffalo bull semen in centrifuged TRIS egg yolk 61.15 ± 0.73, 24.85 ± 0.41, 69.10 ± 0.81, 71.75 ± 0.72, 46.2%, and 46.2%, respectively, followed by centrifuged milk egg yolk extenders.