Possibility study on using an Iranian cottonseed meal variety instead of soybean meal in the rainbow trout (Oncorhynchus mykiss) diet
This study was set up to investigate the nutritional value and the optimum inclusion level of one Iranian cottonseed meal i.e. var. Pak, (CSMP) as a substitute for soybean meal (SBM) in rainbow trout (Oncorhynchus mykiss) feed. Apparent digestibility coefficients (ADC) for these varieties were calculated in experiment 1 by using an indigestible marker (chromic oxide). Six formulated feeds consisting different substitution levels (0, 20, 40, 60, 80, 100%) of SBM with CSMP, CSMS, and CSMA, respectively, were fed to a total of 540 rainbow trout with initial mean body weight of 50 ± 5 g. Fish were randomly stocked into eighteen 100 L. fiberglass tanks with 30 fish per tank and 3 tanks per diet and fed to satiation 3 times a day for 8 weeks. At the end of each separate experiment, 3 fish from each replicate for each dietary treatment were sacrificed to measure the whole fish body proximate compositions and liver gossypol content. After an 8 week feeding trail, the average weight gain, FCR, SGR, PER, DWG, PWG and CF of fish fed with different diets were measured separately. For all treatments, the survival percentage was more than 98%. Results showed that 100% and 80% CSMP showed in better growth in each experiment and 100% CSMP wasthe best in weight gain (104.3 g), FCR (1.5) and SGR (1.25%).
| Main Authors: | , , , , , , |
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| Format: | monograph biblioteca |
| Language: | Persian |
| Published: |
Iranian Fisheries Science Research Institute
2013
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| Subjects: | Aquaculture, Iran, Cotton seed meal, Gossypol, Nutrition, Rainbow trout, Soybean meal, Oncorhynchus mykiss, Diet, Survival, Growth, Weight gain, |
| Online Access: | http://hdl.handle.net/1834/39758 |
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