碩士 / 國立臺灣海洋大學 / 水產養殖學系 / 97 / This study evaluated the effect of replacing soybean meal by maize or sorghum DDGS (Distiller’s dried grains with solubles) in the diets of grass carp (Ctenopharygodon idella). Grass carp is an important cultured herbivore. In 2002, the production is about 3.6 million tonnes which shares about 15.6% of the world freshwater aquaculture production. DDGS is a by-product of the ethanol distillery industry. Its crude protein, crude fat, mineral and vitamin are 3 folds as the grain from which it has been made. Moreover, less expensive than its original grain make DDGS an excellent candidate for feed ingredient. Nine diets were formulated to replace soybean meal by maize or sorghum DDGS at 0 (control), 20, 40, 60 or another 60% supplemented with 0.03% enzyme (xylanase). Results from the 10-week feeding trial indicated that percent weight gain (PCWG), weekly growth rate (GR), feed conversion ratio (FCR), protein efficiency ratio (PER) and body composition of fish fed both DDGS sources were comparable to the control group. Fish fed maize DDGS at different levels had no significant difference in PCWG, GR, FCR, PER and survival, however, the fish fed maize DDGS had higher body lipid content than the control. In the same manner, fish fed sorghum DDGS at different levels had no significant difference on PCWG, GR, FCR, PER and survival, though body lipid content at 20% DDGS replacement level was higher than at 40%, 60% and control. At different replacement levels with either maize or sorghum DDGS, there was no significant difference on PCWG, GR, FCR, PER and survival. Nevertheless, it was found out that fish fed maize DDGS had higher body lipid than fish fed sorghum DDGS. Additionally, the effect of the supplemented enzyme on PCWG, GR, FCR, PER, survival and body composition was not significant. This study concluded that while soybean meal in grass carp diet was replaced by maize or sorghum DDGS at 60% and without enzyme addition, no impairment in growth resulted. Diets containing either corn or sorghum DDGS at all levels had lower cost than the control, saving 1.65~4.5% and 3.8~13.7%, respectively
| Identifer | oai:union.ndltd.org:TW/097NTOU5086058 |
| Date | January 2009 |
| Creators | Si-Yi Wu, 吳思怡 |
| Contributors | Dr.Yew-Hu Chien, 陳瑤湖 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 83 |
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