Effect of tris-extender supplemented with various concentrations of strawberry (Fragaria spp.) on bull semen preservability

Objective: To evaluate effect of tris-extender supplemented with various concentrations of strawberry (Fragaria spp.) on bull semen preservability.Methods: Pooled bull semen were extended with tris-citrate-fructose egg yolk diluent (control, 0% strawberry) and various concentrations of tris strawberry (TSB) (1%-6%) to achieve 60 million motile spermatozoa per milliliter. Extended semen were subjected to semen freezing protocol. Semen assessment including motility, alive%, abnormality%, intact sperm membrane (hypo-osmotic swelling test) and conception rate were carried out for both chilled and frozen semen.Results: Results showed that sperm motility after chilling was enhanced in groups treated with various concentrations of TSB from 1% to 5% and exhibited higher significance (P<0.000 1) at 6-day post-chilling. In frozen semen, 3%, 4%, 5% and 6% concentrations gave the best significance (P<0.000 1) on sperm motility in comparison with the control. Concentration 1% revealed the highest significance (P<0.000 1) on alive% as compared to the control. Hypo- osmotic swelling test was maintained as the control. Concentration 3% gave the lowest significance (P