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Abstract
The present study was carried out at the wet laboratory, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt. Fish produced to study the effect of Bifidobacterium animalis as food additive on the growth performance, immune response and liver functions of Oreochromis niloticus and measured the mortality ratio after infection with Aeromonas hyDROPhila pathogen under different experimental conditions.
In this study, 180 O.niloticus were divided into 6 equal groups (1- 6) , two experiments were done , Exp I included 3 groups, group 1, group 2, were fed on 1& 2g B. animalis/ Kg food for 45 days, respectively. While group 3 was a control. Weight gain, ADG and SGR% were calculated, blood samples (with and without anticoagulant) were taken and immune responses and liver functions were detected and recorded the histopathological changes in liver and spleen sections as immune organs in Oreochromis niloticus.
Exp.II included 3 groups group 3, group 4 were fed on 1&2g B. animalis/ Kg food for 45 days, respectively while group 6 was a control.
Challenge test was done by I/P injection of 2 doses of A.hyDROPhila (0.5, 1ml), mortality ratio was detected after each dose.
Results revealed that use of B.animalis at a low concentration 1g/Kg food can improve growth performance, immune response and liver functions. Also using of B. animalis as food additive at low concentration decreased the mortality due to infection than the control. So, it can be concluded that the two doses of Bifidobacterium animalis when mixed with food may enhanced the growth performance, improved the immune functions, enhancement liver enzymes and improved the survival and increased resistance of O.niloticus to the challenge infections with A. hyDROPhila pathogen.