alexa Immunomodulation of Labeo rohita juveniles due to dietary gelatinized and non-gelatinized starch.
Agri and Aquaculture

Agri and Aquaculture

Journal of Aquaculture Research & Development

Author(s): Kumar V, Sahu NP, Pal AK, Kumar S

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Abstract A 60 days experiment was conducted to study the effect of dietary gelatinized (G) and non-gelatinized (NG) starch on immunomodulation of Labeo rohita juveniles. Two hundred and thirty four juveniles (av. wt. 2.53+/-0.04) were randomly distributed in six treatment groups with each of three replicates. Six semi-purified diets containing NG and G corn starch, each at six levels of inclusion (0, 20, 40, 60, 80, 100) were prepared viz., T(1) (100\% NG, 0\% G starch), T(2) (80\% NG, 20\% G starch), T(3) (60\% NG, 40\% G starch), T(4) (40\% NG, 60\% G starch), T(5) (20\% NG, 80\% G starch) and T(6) (0\% NG, 100\% G starch). After a feeding period of 60 days, the juveniles were challenged with Aeromonas hydrophila to study their immunomodulation due to feeding of G and NG starch. RBC and haemoglobin content were significantly (P<0.05) reduced due to bacterial challenge, but dietary starch (G/NG starch) had no effect on it. G:NG starch ratio in the feed had significant effect on total leukocyte count during pre- and post-challenge periods. The leukocyte count concomitantly increased with the increased level of G starch in the diet. Highest albumin/globulin (A/G) ratio was recorded in T6 group (100\% G starch) and lowest in T1 group (100\% NG starch) group followed by T2 group both in pre- and post-challenge periods. NBT, lysozyme activity, total protein and globulin content were highest in T2 group (80\% NG, 20\% G starch) both in pre- and post-challenge periods. After challenge with A. hydrophila, the highest survival was recorded in T2 group, whereas lowest survival was recorded in T6 group. Conclusively high level of G starch was found to be immunosuppressive in Labeo rohita juveniles and NG:G starch ratio of 80:20 seems to be optimum for promoting growth and protecting immunity in L. rohita juveniles. This article was published in Fish Shellfish Immunol and referenced in Journal of Aquaculture Research & Development

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