Impacto da combinação de bagaço de oliva e polissacarídeos solúveis de linhaça na dieta de tilápia do Nilo

• Ano de defesa: 2024
• Autor(a) principal: Silva, Stéfane Sauzem
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; Brasil; Zootecnia; UFSM; Programa de Pós-Graduação em Zootecnia; Centro de Ciências Rurais
• Palavras-chave em Português: Bagaço de oliva; Estresse oxidativo; Peixes; Nutrição animal polissacarídeos não amiláceos solúveis; Resíduo; Olive pomace; Oxidative stress; Fish; Animal nutrition; Non-starch polysaccharides; By-products; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA
• Link de acesso: http://repositorio.ufsm.br/handle/1/33124

This study was developed with the objective of evaluating the impact of different combinations of processed olive pomace (BOP) and concentrated non-starch polysaccharides from flaxseed (CPNA) on the performance, metabolism, and immunology of Nile tilapia (Oreochromis niloticus). A total of 500 juvenile tilapia with an initial average weight of 2.80 ± 0.35g were used, randomly distributed in 20 polypropylene tanks of 125 liters (25 animals per experimental unit) in a water recirculation system during a 60-day experimental period. Five diets were formulated, four of which tested pure or mixed versions of the bioactive compounds: 100CPNA (homogenized containing 100% CPNA), 30BOP:70CPNA (mixture containing 30% BOP and 70% CPNA), 70BOP:30CPNA (mixture containing 70% BOP and 30% CPNA), and 100BOP (homogenized containing 100% BOP), and a control diet without the inclusion of bioactives. The animals were fed to apparent satiety three times a day. Data were compared using analysis of variance of the means, followed by the Tukey test at a 5% significance level. At the end of the experimental period, performance, body composition, and digestion variables showed no significant differences between treatments. Blood and histological parameters were influenced by the diets. Fish fed the control diet had higher levels of glucose and globulins, while those fed with pure CPNA increased aspartate aminotransferase (AST). Histologically, pure CPNA increased the height of intestinal villi, 30BOP:70CPNA increased villi thickness, and 70BOP:30CPNA and BOP increased the number of goblet cells. In the short-chain fatty acid profile, pure BOP stood out in the production of propionic and butyric acid, while 70BOP:30CPNA reduced butyric acid. In antioxidant parameters, 70BOP:30CPNA showed higher oxidative stress. Analyzing all treatments, it is clear that the combination of BOP and CPNA presented both benefits and challenges. The study suggests that the inclusion of olive pomace in tilapia diets, especially in combination with CPNA, can be beneficial in certain aspects but requires careful balance to avoid adverse effects on fish health. It is concluded that the 30BOP:70CPNA proportion brought the most balanced and beneficial results. This combination not only maintained the performance parameters of the fish but also had positive effects on intestinal health and oxidative stress levels when compared to.