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The present study was planned to study the effects of addition of different concentrations of catalase enzyme (0, 250, 500 and 1,000 IU/ml) to cooled dromedary camel semen extended with tris-yolk-fructose extender on semen quality during storage at 5 C for up to 5 days. Conception rates of she-camels artificially inseminated with whole fresh or extended cooled dromedary camel semen with or without 500 IU/ml catalase enzyme were also estimated. The results showed that addition of catalase enzyme at concentrations of 250 or 500 IU/ml to extended cooled dromedary camel semen significantly increased (P&lt;0.01) the percentage of sperm motility and significantly decreased (P&lt;0.01) the percentages of dead spermatozoa, sperm abnormalities and acrosomal damage. The highest (P&lt;0.01) percentage of sperm motility was recorded with extended cooled dromedary camel semen supplemented with catalase enzyme at a concentration of 500 IU/ml, and the lowest (P&lt;0.01) value was recorded with catalase enzyme at a concentration of 1000 IU/ml. On the other hand, the lowest (P&lt;0.01) percentages of dead spermatozoa, sperm abnormalities and acrosomal damage of spermatozoa were recorded with extended cooled dromedary camel semen supplemented with 500 IU/ml, and the highest (P&lt;0.01) values were recorded with catalase enzyme at a concentration of 1,000 IU/ml. Advancement of the storage time at 5 C significantly decreased (P&lt;0.01) the percentage of sperm motility and significantly increased (P&lt;0.01) the percentages of dead spermatozoa, sperm abnormalities and acrosomal damage of spermatozoa. Moreover, the conception rates of she-camels artificially inseminated with whole fresh, extended cooled dromedary camel semen free-catalase enzyme and extended cooled dromedary camel semen supplemented with catalase enzyme at a concentration of 500 IU/ml were 46.15, 22.22 and 37.50%, respectively. In conclusion, the results show that addition of catalase enzyme at a concentration of 500 IU/ml to semen extender can be used as an agent for prolongation of dromedary camel sperm cell survival during storage at 5 C.

Survival and Fertility Rate of Cooled Dromedary Camel Spermatozoa Supplemented with Catalase Enzyme