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A, B and C dilutors were used to make Ka (A plus B (1 : 1)) and Na (B plus C(1 : 1)) dilutors in this experiment. Three aliqots of semen were respectivly diluted 1 : 1 and 1 : 2 (semen: dilutor) with Ka, Na and C dilutors and stored at 5^{circ}C for 7 days in order to study their livability during storage. Fertility was checked for the diluted semen with Ka, Na and C dilutors. Whole semen and extended semen with Na dilutos with and without DMSO were cold shocked at various temperatures for 10 min. Effects of different 1st and 2nd dilution with A, B, C and Na dilutors and of vessels on freezability of spermatozoa were investigtigated. 1. Extended semen 1 : 2 with Na and C dilutors showed highest live sperm index during storage for 7 days at 5^{circ}C. 2. The components of Na dilutor per 100mell were skim milk 2.5g, trisaminomethane 0.54g, citric acid 0.265g, glucose 2.835g, fructose 1.5g, sodium lauryl sulfate, 0.08g, penicillin 0.06g, streptomycin 0.075g, and egg yolk 10mell. 3. Fertility of diluted semen was higher than that of whole semen. Ka dilutor showed higher fertility than Na and C dilutors, and there was no difference in the fertility between Na and C dilutors. 4. Na dilutor with DMSO showed slightly higher livability than Na dilutor without DMSO during storage for 7 days at 5^{circ}C. 5. Cold shock at 10^{circ}C for 10 min. decreased greatly the sperm livalility of whole semen but not of extended semen with Na dilutor. Addition of DMSO to Na dilutor has no effect in prevention of cold shock. 6. The extended semen with C. C dilutor (1st and 2nd dilution with C and C dilutor) showed higher post-thawing sperm livability than A.A and Na. B dilutors. Na. B dilution shwed higher post-thawing sperm livability than A.A dilution. There was no difference in the post-thawing livability between semen in 1mell straw and 10mell aluminium package.
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