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  • 1
    Publication Date: 2021-05-19
    Description: Rainbow trout with initial body weight 4.16 plus or minus 0.25 g were fed diets that contained crude protein 42%; gross energy 4400 Kcal/kg DM; crude fat 10% including graded levels of canola meal (CP 35% DM). A growth trial was conducted over 16 weeks at a water temperature of 12 plus or minus 1C. At the end of the growth trial, in addition to body composition analyses, plasma triiodothyronine (T3) and thyroxin (T4), cholesterol and liver fatty acid composition were measured. Replacement of fish meal with canola meal (10 to 57% replacement) did not significantly affect the growth performance (P〉0.05). At 16th week, plasma cholesterol levels were reduced in fish fed with all diets in comparison to 8th week. Plasma T4 levels were significantly higher in the canola meal-fed fish sampled after 16 weeks, but no significant differences in T3 levels were obtained (P〉0.05). Proximate composition was affected by dietary treatments. The liver fatty acid composition reflected that of the fish fed with canola meal diet has a higher level of polyunsaturated (n-6) fatty acids compared to the control group in which a higher content of n-3:n-6 ratio was seen as opposed to the treatment. With increasing canola meal in diets, the cost of final food was reduced. This study showed that canola meal has potential to replace substantial levels of fish meal in diets for carnivorous fish without compromising performance.
    Description: Published
    Keywords: Oncorhynchus mykiss ; Diets ; Growth ; Liver ; Fatty acids ; Thyroid ; Hormones ; Freshwater
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.81-100
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  • 2
    Publication Date: 2021-05-19
    Description: Juvenile rainbow trout, Oncorhynchus mykiss (initial body weight 14 ± 0.25 g) were fed diets [crude protein 420 g/kg; gross energy 16.8 MJ/kg dry matter; crude fat 110 g/kg] containing deficient, adequate or excessive amounts of vitamin C and folic acid to investigate the potential nutritional effects on growth factors. A growth trial was conducted over 9 wks at a water temperature of 12 ± 1 °C. Four semipurified diets were supplemented with 0, 30, 60 and 90 mg /kg vitamin C and 0, 1, 2 and 3 mg/kg folic acid and were fed to fish in triplicate tank for 9 wks. At the end of the growth trial, the percent of survival, final body weight, weight gain, feed intake, feed conversion ratio, protein efficiency ratio and specific growth rate were measured. The results that growth factors were significantly (P 〈 0.05) affected by dietary vitamin levels. Inclusion levels of 2 mg/kg dietary folic acid and 60 mg/kg dietary vitamin C is acceptable, for use in rainbow trout diets, under favorable economic conditions. This study shows that increasing dietary folic acid and vitamin C could improve growth performance in juvenile rainbow trout.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Nutritional ; Nutrition ; Folic acid ; Vitamin C ; Rainbow trout ; Oncorhynchus mykiss ; Juvenile ; Growth ; Survival
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 40pp.
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  • 3
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    In:  http://aquaticcommons.org/id/eprint/23769 | 18721 | 2018-07-25 08:42:23 | 23769 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-15
    Description: Rainbow trout with initial body weight 4.16 plus or minus 0.25 g were fed diets that contained crude protein 42%; gross energy 4400 Kcal/kg DM; crude fat 10% including graded levels of canola meal (CP 35% DM). A growth trial was conducted over 16 weeks at a water temperature of 12 ±1C. At the end of the growth trial, in addition to body composition analyses, plasma triiodothyronine (T3) and thyroxin (T4), cholesterol and liver fatty acid composition were measured. Replacement of fish meal with canola meal (10 to 57% replacement) did not significantly affect the growth performance (P〉0.05). At 16th week, plasma cholesterol levels were reduced in fish fed with all diets in comparison to 8th week. Plasma T4 levels were significantly higher in the canola meal-fed fish sampled after 16 weeks, but no significant differences in T3 levels were obtained (P〉0.05). Proximate composition was affected by dietary treatments. The liver fatty acid composition reflected that of the fish fed with canola meal diet has a higher level of polyunsaturated (n-6) fatty acids compared to the control group in which a higher content of n-3:n-6 ratio was seen as opposed to the treatment. With increasing canola meal in diets, the cost of final food was reduced. This study showed that canola meal has potential to replace substantial levels of fish meal in diets for carnivorous fish without compromising performance.
    Keywords: Biology ; Canola Meal ; Thyroidal Hormones ; Cholesterol ; Rainbow Trout ; Feeding ; Yasoj ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 81-100
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  • 4
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    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25332 | 18721 | 2018-09-13 12:55:23 | 25332 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-16
    Description: Juvenile rainbow trout, Oncorhynchus mykiss (initial body weight 14 ± 0.25 g) were fed diets [crude protein 420 g/kg; gross energy 16.8 MJ/kg dry matter; crude fat 110 g/kg] containing deficient, adequate or excessive amounts of vitamin C and folic acid to investigate the potential nutritional effects on growth factors. A growth trial was conducted over 9 wks at a water temperature of 12 ± 1 °C. Four semipurified diets were supplemented with 0, 30, 60 and 90 mg /kg vitamin C and 0, 1, 2 and 3 mg/kg folic acid and were fed to fish in triplicate tank for 9 wks. At the end of the growth trial, the percent of survival, final body weight, weight gain, feed intake, feed conversion ratio, protein efficiency ratio and specific growth rate were measured. The results that growth factors were significantly (P〈0.05) affected by dietary vitamin levels. Inclusion levels of 2 mg/kg dietary folic acid and 60 mg/kg dietary vitamin C is acceptable, for use in rainbow trout diets, under favorable economic conditions. This study shows that increasing dietary folic acid and vitamin C could improve growth performance in juvenile rainbow trout.
    Keywords: Aquaculture ; Iran ; Nutrition ; Folic acid ; Vitamin C ; Rainbow trout ; Oncorhynchus mykiss ; Juvenile ; Growth ; Survival
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 40
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