中华鳖附睾内超氧化物歧化酶（SOD）活力的季节性变化

he superoxide dismutase (SOD) activity within both tissue and fluid in each segment of epididymis were measured during reproductive seasons（June and August）and hibernation seasons（December and February）, in order to study the variation of SOD in epididymis of Chinese soft-shelled turtle, during the reproductive cycles. The results showed that the SOD activity within epididymal fluid had varied among each segment of epididymis throughout the reproductive cycles, and was higher in reproductive seasons than it in hibernant seasons at same segment. It showed the highest SOD activity within caudal epididymal fluid, 1518.53 ± 124.88 U/mL, extremely striking contrast with it in caput and corpus（P <0.05）, during reproductive seasons. However, in hibernant seasons, the SOD activity within caput epididymal fluid was the highest, 508.45 ± 45.40 U/mL, and significant different with it in corpus and cauda（P<0.05）. Among epididymal tissue, the SOD activity had a little discrepancy, and had the highest level at cauda, 137.58±14.81 U/mgprot, that was significanlyt different with it in corpus（P<0.05）, while not at caput（P>0.05）, during reproductive seasons .The SOD activity within epididymal tissue had no significant contrast among each segments（P>0.05）in hibernation seasons, and was lower than it in reproductive seasons. In the epididymis, the SOD activity showed seasonal variation, suggestted that it might have a certain correlation with the movement and storage of sperm in the epididymis.