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Exogenous phytase and xylanase supplementation of formulated diets for rohu (Labeo rohita): impact on haematology, histology and IGF I gene expression

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Abstract

The present study aims to delineate the effect of exogenous enzyme supplementation of fermented or non-fermented de-oiled rice bran (DORB) on haematology, histology and expression of IGF I gene expression of Labeo rohita. Four test diets, namely, T1 (DORB), T2 (fermented DORB), T3 (DORB+exogenous enzyme) and T4 (fermented DORB+exogenous enzyme) were formulated and fed to the L. rohita for a period of 60 days. The test diets T3 and T4 were supplemented with 0.1 g kg-1 xylanase (16,000 U kg−1) and 0.1 g kg-1 phytase (500 U kg−1) enzymes. A total of 120 juveniles of L. rohita (average weight 5.01 ± 0.02 g) were stocked in 12 rectangular tanks with 10 fish per tank in triplicates. At the end of the experiment, haematology, histology and IGF I gene expression of the different groups were analysed. The haemoglobin (Hb) content, RBC count and WBC count of L. rohita varied significantly (p < 0.05) among different groups. T3 diet–fed group had the highest Hb content, RBC count and WBC count as compared to the other groups. The MCV content was significantly (p < 0.05) lower in T3 group. The DORB type, exogenous enzyme supplementation and their interaction have no significant (p > 0.05) effect on MCH, MCHC and lymphocyte content of the cultured fish. The group which were fed T3 diet had significantly (p < 0.05) higher IGF-I gene expression as compared to other groups. The histological examination of liver revealed no pathological alteration of this organ. Similarly, there were no pathological changes observed in intestinal tissue in any dietary treatment group. Based on the findings of the present study, it is concluded that exogenous enzyme supplementation of DORB-based diets improves the physiological status and growth performances of Labeo rohita.

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The authors declare that data supporting the findings of this study are available within the article.

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Acknowledgements

The authors are thankful to the Director, ICAR-Central Institute of Fisheries Education, Mumbai, for providing all the required facilities and infrastructure to carry out this research. The authors sincerely acknowledge the support of Vaighai Agro Products Limited, Tamil Nadu, for supplying DORB and AB Vista, India, for arranging enzymes free of cost for the successful completion of this research work. The financial support provided by ICAR-Central Institute of Fisheries Education, Mumbai, for successful completion of this research work is gratefully acknowledged.

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Authors and Affiliations

  1. Fish Nutrition, Biochemistry and Physiology Division, ICAR-Central Institute of Fisheries Education, Off Yari Road, Panch Marg, Versova, Mumbai, 400061, India

    Amit Ranjan, Sarvendra Kumar, Narottam Prasad Sahu, Kamal Kant Jain & Ashutosh Dharmendra Deo

  2. Institute of Fisheries Post Graduate Studies, Tamil Nadu Dr. J. Jayalalithaa Fisheries University, OMR Campus, Vaniyanchavadi, Chennai, Tamil Nadu, 603103, India

    Amit Ranjan

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  1. Amit Ranjan
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Contributions

Amit Ranjan performed the experiment, collected and analysed data and written the draft of the manuscript. Sarvendra Kumar has performed the gene expression study and analysis. Narottam Prasad Sahu has supervised the first author, designed the experiment and corrected the draft of the manuscript. Kamal Kant Jain has helped in the analysis and correction of the draft of the manuscript. Ashutosh Dharmendra Deo has helped in the analysis and interpretation of data and correction of the draft of the manuscript. All authors have read and approved the manuscript.

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Correspondence to Amit Ranjan.

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Ranjan, A., Kumar, S., Sahu, N.P. et al. Exogenous phytase and xylanase supplementation of formulated diets for rohu (Labeo rohita): impact on haematology, histology and IGF I gene expression. Fish Physiol Biochem 47, 49–58 (2021). https://doi.org/10.1007/s10695-020-00893-7

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