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題名 | Sex Differences in the Responses of Serum Calcium Concentrations to Temperature and Estrogen in Tilapia, Oreochromis mossambicus=吳郭魚血鈣濃度對溫度及雌性素反應之性別差異 |
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作者 | 蔡錦玲; 王立雪; Tsai, Ching-lin; Wang, Li-hsueh; |
期刊 | 動物研究學刊 |
出版日期 | 20000100 |
卷期 | 39:1 2000.01[民89.01] |
頁次 | 頁55-60 |
分類號 | 388.5 |
語文 | eng |
關鍵詞 | 雌性素; 血鈣; 性別差異; 溫度; 吳郭魚; Estradiol; Serum calcium; Sex difference; Temperature; Tilapia; |
中文摘要 | 本研究以吳郭魚探討溫度及雌性素對魚體血鈣濃度之影響並比較雌、雄之差異。結果發現吳郭魚分別飼養在26℃、29℃及32℃,經21天後,雌魚之血鈣濃度隨溫度而顯著增加;雄魚則不受溫度影響。而且,飼養於同一水溫下,雌魚之血鈣濃度階顯著高於雄魚。另一方面,排卵前期雌魚之血鈣濃度顯著高於排精前期之雄魚。兩者去除性腺後則無顯著差異。去除性腺並投予雌性素,經21天後,雌雄吳郭魚之血鈣濃度皆顯著增加,其增加量與雌性素投予量成正相關,但是,雌性素引發之高血鈣效應在雄魚顯著高於雌魚。此結果說明溫度對吳郭魚血鈣調節系統之影響具性別差異,雌魚具溫度相關性而雄魚則無。 |
英文摘要 | Sex differences in the responses of serum calcium concentrations to temperature and estrogen in tilapia, Oreochromis mossambicus, were investigated. Prespawning males and females were kept at 26, 29, and 32℃ aquatic temperatures for 21 d. The serum calcium levels increased by were not altered in males. Females showed higher serum calcium levels than males at the 26, 29, and 32℃ exposure groups, respectively. On the other hand, males and females were gonadectomized and treated with different dosages of 17β-estradiol for 21 d. Serum calcium levels significantly decreased after gonadectomy in females but were not altered in males. There was no difference in serum calcium levels between gonadectomized males and females. Treatment with 17β-estradiol at 50 or 100mg/kg diet significantly increased serum calcium levels dose-dependently in both gonadectomized males and females. The hypercalcemic effect of 17β-estradiol was greater in castrated males. These results suggest that the estrogen induced calcium regulatory system is temperature dependent in females and not in males. On the other hand, estrogen induced elevation of blood calcium level is more pronounced in males than in females. |
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