Muna M. M. Ahmed and A. Abdel Gadir

Faculty of Animal Production, P. 0. Box 32 Khartoum North, Sudan.

SUMMARY

Semen was” collected from six Saanen bucks using an artificial vagina. Collection was done at weekly intervals throughout the seasons of one year. The bucks were imported from bland and were allowed one year acclimatization period under the dry-arid climate of Khartoum. Three different types of diluents were used for processability and freezability of the semen. These were skimmed-milk diluent for short-term storage at +5 °C. The other two diluents were intended for deep freezing of semen in liquid nitrogen. Both diluents composed of the same constituents (tris-egg-yolk) but one was used for the one-step method of dilution and the other for the two-steps method of dilution. Percentage motility of spermatozoa that survived after freezability were not significant between the two methods. However, percentage motility of spermatozoa processed with milk was significantly high. For all types of diluent, the effect of season has shown that percentage motility of spermatozoa was lowest in Summer compared to Autumn and Winter.,

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