碩士 / 國立海洋大學 / 食品科學系 / 88 / Two experiments were conducted to quantify the optimum dietary folic acid requirements of juvenile hybrid tilapia (Oreochromis niloticus x O. aureus) and juvenile grass shrimp (Penaeus monodon).
ExperimentⅠ. Purified diets with 8 levels ( 0, 0.3, 0.6, 1.0, 3.0, 6.0, 10.0 and 20.0 mg/kg diet) of supplemented folic acid were fed to juvenile hybrid tilapia (mean body weight 0.41±0.01 g) for 8 weeks. Each diets was fed to triplicate groups of fish. Results indicated that fish fed diets supplemented with 10 and 20 mg folic acid/kg diet had significantly (P<0.05) higher weight gain than fish fed 0, 0.3 and 3.0 mg/kg diet. Fish fed 0 and 0.3 mg folic acid/kg diet had poorer feed efficiency (FE) than fish fed 10 mg folic acid/kg diet. Fish fed 10 mg folic acid/kg diet had better protein efficiency ratio (PER) than fish fed 0 and 0.3 mg folic acid/kg diet. Hepatosomatic index (HSI) and survival were not affected by folic acid supplementation level. Weight gain of fish were analyzed by broken-line analysis indicated that the adequate dietary folic acid requirement for maximum growth of tilapia is 10.95 mg/kg diet.
ExperimentⅡ. Purified diets with 8 levels ( 0, 1, 2, 5, 10, 15, 30 and 60 mg/kg diet) of supplemented folic acid were fed to juvenile P. monodon (mean body weight 0.79±0.02 g). Each diet was fed triplicate groups of shrimp in a non-recirculated rearing system for 8 weeks. Results indicated that shrimp fed diets supplemented with 2, 5, 10, 15, 30 and 60 mg/kg diet had significantly higher weight gain than shrimp fed the unsupplemented control diet. Shrimp fed 0 and 1 mg/kg diet had poorer FE and PER than those fed other diets. Survival were not affected by folic acid supplementation level. Shrimp fed diets without folic acid had significantly lower HSI than shrimp fed 2, 30 and 60 mg/kg diet. Broken-line analysis showed that the dietary folic acid requirements for maximum growth of P. monodon is 1.86 mg/kg diet.
| Identifer | oai:union.ndltd.org:TW/088NTOU0253007 |
| Date | January 2000 |
| Creators | Shih-Ying Huang, 黃詩瑩 |
| Contributors | Shi-Yen Shiau, 蕭錫延 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 0 |
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