Abstract
Diet supplemented with nettle Urtica dioica and tarragon Artemisia dracunculus leaf powder on fingerling rainbow trout Oncorhynchus mykiss was assessed. Fish of initial body weight 7.41 ± 0.16 g, were distributed in six groups, three replications, and were fed 8 weeks. 0 (control), 10 nettle (N1), 30 nettle (N3), 10 tarragon (T1), 30 tarragon (T3) and 10 nettle +10 tarragon g/kg (N1+T1) diet. The N3 improved FBW, WG, WG% and SGR significantly (p ≤ 0.05). N3 increased body protein, ash and decreased body fat significantly (p ≤ 0.05). The highest haematocrit was observed in T3 significantly (p ≤ 0.05). The highest WBC in T3, and RBC and Hb in N1+T1 were observed (p ≤ 0.05). N1 and N1+T1 showed the highest MCV (p ≤ 0.05). N1, T1 and N1+T1 showed the highest MCH (p ≤ 0.05). The highest MCHC was observed in T1 significantly (p ≤ 0.05). N3, T3 and N1+T1 demonstrated the highest albumin levels (p ≤ 0.05). The T1 increased serum lysozyme activity compared to control (p ≤ 0.05). The highest serum total immunoglobulin and total protein in N3 were observed (p ≤ 0.05). The results showed beneficial effects of N3, T3 and N1+T1 on growth performance, body proximate composition and blood parameters.
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