Determination the impact of use of dietary vegetable oil source and different levels of L-carnitine supplementation on hematological and immunological parameters of rainbow trout (Oncorhynchus mykiss)
Resumo
The aim of current study was to determination the impact of different dietary vegetable oil source and L-carnitine supplementation on hematological and immunological parameters of rainbow trout. The number of 288 rainbow trout fish were fed by 2×2 randomized experimental factorial designs were used with 4 replicate each. Dietary treatments contained fish oil or vegetable oil and two dietary levels of L-carnitine (0.6 or 1.2 g.kg-1) supplement respectively. Experiment period of trials lasted for 9 weeks. At the end of experiment period, hematological and immunological parameters such as immunoglobulin M (IgM) concentration of fish blood were determined. Results of study showed that replacement of fish oil by vegetable oil significantly increased blood hematocrit, red blood cell count, hemoglobin in comparison with fish oil dietary treatment (p≤0.05). Dietary L-carnitine supplementation reduced heterophils (p≤0.05) and L-carnitine supplementation with fish oil diets increased lymphocyte and reduced IgM and IgG significantly instead (p<0.05). In conclusion we may demonstrate that use of dietary vegetable oil sources with different levels of L-carnitine supplementation has beneficial acts on immunological response and hematological traits of rainbow trout Fish.
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Referências
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