Feeding Dietary Mannan Oligosaccharides to Juvenile Nile Tilapia,Oreochromis niloticus,Has No Effect on Hematological Parameters and Showed Decreased Feed Consumption |
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| Authors: | Ricardo Yuji Sado ÁLvaro José De Almeida Bicudo José Eurico Possebon Cyrino |
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| Institution: | 1. Escola Superior de Agricultura “Luiz de Queiroz,” Universidade de S?o Paulo – Programa de Pós‐Gradua??o em Ciência Animal e Pastagem, CP 09 – 13418‐900 Piracicaba, S?o Paulo, Brazil;2. Escola Superior de Agricultura “Luiz de Queiroz,” Universidade de S?o Paulo – Departamento de Zootecnia/Setor de Piscicultura, CP 09 – 13418‐900 Piracicaba, S?o Paulo, Brazil |
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| Abstract: | Impaired immune system by environmental stressors can lead fishes to be more susceptible to diseases that limit the economic development of aquaculture systems. This study was set out to determine the effect of six levels of mannan oligosaccharides (MOS; ActiveMOS®; Biorigin, Lençois Paulista, São Paulo , Brazil) on the performance index and hematology of Nile tilapia, Oreochromis niloticus juveniles. Fish (13.62 g) were randomly distributed into 18 plastic aquaria (300 L; 20 fishes per aquarium) and fed during 45 d with a commercial diet supplemented with 0, 0.2, 0.4, 0.6, 0.8, and 1% dietary MOS, in a totally randomized design trial (n = 3); biometrical and hematological data were collected and analyzed. There were no significant differences in hematological parameters between fish fed control and MOS supplementation diets, and daily feed consumption (FC) decreased (P < 0.05) with increasing levels of dietary MOS. Dietary MOS did not increase leukocyte count and presented negative effects on FC of Nile tilapia. At 0.4% MOS supplementation, the individual weight gain was higher in absolute values but not different (P > 0.05) compared to control diet. |
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