Effect Of Glucosinolate In Diets Containing Canola Meal On Rainbow Trout (Oncorhynchus Mykiss) Blood Serum
2007
Safari, O., Former Graduted Student. Faculty of Fishery and Environment Science. Gorgan University. | Boldaji, F., Prof. Facul of Rang Manage. And Water., Gorgan University of Agric. Scien. Nat. Rcsour. Gorgan. Iran. | Hajimoradloo, A., Assoc. Prof. Facult. of Fishery and Envi. Scien. Gorgan Univ. of Agic. Scien. Nat Resourc Gorgan. Iran.
Vegetative protein sources have an important role on reducing cost of diet. Use of these sources have also different metabolic effects. A 56 days feeding trial was conducted with rainbow trout to examine the effects of substitution of canola meal (containing 12.5آµmol Glucosinolate/g DM) with fishmeal in diets. Canola meal was substituted by fishmeal at 5 levels 10,20,30,40 and 50 percentage. Each diet was assigned to triplicate groups in a completely randomized design with a control diet. Diets were isonitrogenous and isoenergetic. Two hundred and sixteen fishes with average weight 100آ±15g were used in this trial. Twelve fishes were randomly assigned to each of 18 tanks and were acclimated in these plastic tanks to the experimental conditions two weeks before treatment began. After 56 days from each diet, 6 fishes were chosen, stunned and bled.Concentrations of serum thyroid stimulating hormone (TSH), thyroxine (T4) and triiodothyronine (T3) were measured. Substitution of canola meal to 50 percent caused no significant difference in TSH, T4,T3 concentrations and T3/T4 ratio of fish feeding canola meal in comparison with conrol fish (p0.05) .Comparisons of diets containing canola meal showed that influencing levels of Glucosinolate quantity on T4 and T3 concentrations were 0.625 and 2.5آµmol/g DM diet,respectively. These results showed that fishmeal of control diet was replaceable by canola meal at level of 40 percentage.
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