Volume 14, Issue 1 (2012)
JAST 2012, 14(1): 149-159 |
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Asadi R, Imanpoor M R, Dastar B. Requirements of n-3 Highly Unsaturated Fatty Acids in Beluga (Huso huso) Juvenile and their Effects on Growth, Carcass Quality and Fatty Acids Composition. JAST 2012; 14 (1) :149-159
URL: http://jast.modares.ac.ir/article-23-5637-en.html
URL: http://jast.modares.ac.ir/article-23-5637-en.html
1- Fisheries Department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Islamic Republic of Iran.
2- Department of Animal Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Islamic Republic of Iran.
2- Department of Animal Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Islamic Republic of Iran.
Abstract: (6065 Views)
An 8-week feeding experiment was carried out on beluga (Huso huso) juvenile to evaluate the effects of different levels of fish oil containing n-3 highly unsaturated fatty acids (n-3 HUFAs) on fish growth and fatty acid composition. The requirements of beluga juvenile for n-3 HUFAs were studied by feeding fish diets containing six different levels of n-3 HUFAs ranging from 1.56 to 17.25% (% of total fatty acids). Weight gain, feed conversion ratio, condition factor, specific growth rate and protein efficiency ratio were not significantly different among dietary treatments, nor was the body composition (including: moisture, protein, lipid and ash) of beluga juvenile (P> 0.05). There were no significant differences among plasma protein, glucose, cholesterol and triglyceride contents of dietary treatments (P> 0.05). However, haematocrit values were significantly lower in diets 1 and 2 (P< 0.05). The fatty acid composition of fish showed a pronounced change from the initial carcass with fatty acid composition changes in experimental diets. The fatty acid composition of the beluga carcass fed on diets containing various levels of n-3 HUFAs reflected the dietary fatty acid composition. The n-3 HUFAs contents of the lipids of fish increased with an increase in dietary n-3 HUFAs levels. Results suggested that minimum levels of n-3 HUFAs in diet have no effect on growth and n-3 HUFAs are not a restrictive factor on growth in beluga.
Received: 2010/01/31 | Accepted: 2011/11/1 | Published: 2011/11/1
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