https://scholars.lib.ntu.edu.tw/handle/123456789/320953
Title: | Schizochytrium limacinum SR-21 as a source of docosahexaenoic acid: Optimal growth and use as a dietary supplement for laying hens | Authors: | Chin, H.J. Shen, T.F. Su, H.P. SHIH-TORNG DING |
Keywords: | Laying Leghorn hens; Lipid metabolism | Issue Date: | 2006 | Journal Volume: | 57 | Journal Issue: | 1 | Start page/Pages: | 13-20 | Source: | Australian Journal of Agricultural Research | Abstract: | Culture conditions for the marine fungus Schizochytrium limacinum SR-21 (SR-21) to produce microbial docosahexaenoic acid (DHA) were evaluated, and the practicality of using this fungus product as a dietary supplement for laying Leghorn hens was investigated. The data showed that the cultured fungus produced high biomass and DHA. It generated 584 mg DHA/L of culture at the end of a 6-day culture. The fungus grew better at 25°C than at 20°C or 30°C. With an increase in glucose concentration from 1% to 5% in the culture medium, biomass and DHA production were enhanced. A 6% glucose treatment reduced the biomass production compared with 5% glucose. A bioreactor was used to mass-produce SR-21. The biomass was increased from 1.12 g/L at Day 0 to 12 g/L at Day 4. We established optimal culture conditions of 5% glucose, 2% sea salt, and 1% yeast extract for SR-21. Three concentrations of dried fungal meal (0, 1, or 3% in the diet) were fed to birds over a 3-week period. There were no negative effects of 1 and 3% dietary SR-21 on egg production, egg weight, and egg yolk weight. The DHA content of yolk was increased by the dietary supplementation with the fungal meal both in the 1 and 3% treatments. Dietary fungal meal treatments increased the DHA concentrations of liver and plasma. However, dietary DHA enrichment had no effect on the expression of hepatic lipogenic genes in laying hens. © CSIRO 2006. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-31744444773&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/320953 |
DOI: | 10.1071/AR05099 | SDG/Keyword: | food supplementation; fungus; growth; lipid; poultry; Aves; Fungi; Schizochytrium limacinum |
Appears in Collections: | 動物科學技術學系 |
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