title: Effect of xylan oligosaccharides generated from corncobs on food acceptability, growth performance, haematology and immunological parameters of Dicentrarchus labrax fingerlings.
abstract: The objective of this study was to determine the effect of two levels of inclusion of xylan oligosaccharides (XOS) extracted from corncob on growth, feed utilization, immune status and disease resistance of Mediterranean sea bass (Dicentrarchus labrax) fingerlings. Specimens of 4.75 ± 0.69 g at initial density of 2.7 ± 0.13 kg/m(3) were fed during 12 weeks at 0 g kg(-1) diet, 5 g kg(-1) diet and 10 g kg(-1) diet, dietary XOS level of inclusion in a commercial sea bass diet. Feeding the fish at both XOS dietary inclusion levels significantly increased weight gain, protein efficiency ratio and feed conversion ratio. Feeding of supplemented diets to fish led to reducing mortalities after challenging with A. hydrophila. The haematological and immunological parameters were assayed in both pre-challenged and post-challenged groups. There was an increased trend in red blood corpuscles, white blood corpuscles, pack cell volume, haemoglobin (Hb %) and serum protein content in treated groups over the control as time elapsed with the feeding trials. The serum immunoglobulin level and lysozyme activity showed an increased trend in the fed groups. Histological features of the liver showed lower lipid vacuolization and regular-shaped morphology of hepatocytes around the sinusoidal spaces denoting a better utilization of dietary nutrients supported with the morphometric data. In conclusion, XOS added at a designated dose (5 g kg(-1) diet) in the diet improves growth and stimulates the immunity and makes D. labrax fingerlings more resistant to infection by A. hydrophila.
authors.affiliation: Unité Enzymes et Bioconversion, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, route de Soukra, 3038, Sfax, Tunisia.
authors.forename: Baha Eddine
authors.initials: BE
authors.lastname: Abdelmalek
authors.affiliation: Unité Enzymes et Bioconversion, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, route de Soukra, 3038, Sfax, Tunisia. dorra_driss@yahoo.fr.
authors.forename: Dorra
authors.initials: D
authors.lastname: Driss
authors.affiliation: Unité Enzymes et Bioconversion, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, route de Soukra, 3038, Sfax, Tunisia.
authors.forename: Fatma
authors.initials: F
authors.lastname: Kallel
authors.affiliation: Institut National Agronomique de Tunisie, 43, Avenue Charles Nicolle, 1082, Tunis, Tunisia.
authors.forename: Molka
authors.initials: M
authors.lastname: Guargouri
authors.affiliation: Institut National Agronomique de Tunisie, 43, Avenue Charles Nicolle, 1082, Tunis, Tunisia.
authors.forename: Hechmi
authors.initials: H
authors.lastname: Missaoui
authors.affiliation: Unité Enzymes et Bioconversion, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, route de Soukra, 3038, Sfax, Tunisia.|Institut National Agronomique de Tunisie, 43, Avenue Charles Nicolle, 1082, Tunis, Tunisia.
authors.forename: Semia Ellouz
authors.initials: SE
authors.lastname: Chaabouni
authors.affiliation: Laboratory of Alimentary Analyses, National School of Engineering of Sfax, Sfax, Tunisia.
authors.forename: Mohamed Ali
authors.initials: MA
authors.lastname: Ayadi
authors.affiliation: Unité Enzymes et Bioconversion, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, route de Soukra, 3038, Sfax, Tunisia.
authors.forename: Ali
authors.initials: A
authors.lastname: Bougatef
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001492:Bass / Q000254:growth & development* / Q000276:immunology; D001798:Blood Proteins / Q000032:analysis; D019587:Dietary Supplements; D004906:Erythrocyte Count; D006454:Hemoglobins / Q000032:analysis; D022781:Hepatocytes / Q000166:cytology; D007113:Immunity, Innate; D007136:Immunoglobulins / Q000097:blood; D007958:Leukocyte Count; D008099:Liver / Q000254:growth & development; D009113:Muramidase / Q000097:blood; D014990:Xylans / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry
chemical_list: D001798:Blood Proteins; D006454:Hemoglobins; D007136:Immunoglobulins; D014990:Xylans; D009113:Muramidase
keywords: Dicentrarchus labrax; Growth performance; Immunology; Liver histology; Xylooligosaccharides