Utilização de subprodutos de cervejaria em dietas para juvenis de tilápia do Nilo

• Ano de defesa: 2025
• Autor(a) principal: Glowka, Renato Paulo
• Orientador(a): Boscolo, Wilson Rogério
• Banca de defesa: Feiden, Aldi , Signor, Arcangelo Augusto , Borba, Maude Regina de , Marcos, Ronan Maciel , Boscolo, Wilson Rogerio
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual do Oeste do Paraná; Toledo
• Programa de Pós-Graduação: Programa de Pós-Graduação em Recursos Pesqueiros e Engenharia de Pesca
• Departamento: Centro de Engenharias e Ciências Exatas
• País: Brasil
• Palavras-chave em Português: Oreochromis niloticus; Subprodutos vegetais; Aquicultura; Nutrição animal
• Palavras-chave em Inglês: Plant by-products; Aquaculture; Animal nutrition.
• Área do conhecimento CNPq: CIENCIAS AGRARIAS::RECURSOS PESQUEIROS E ENGENHARIA DE PESCA
• Link de acesso: https://tede.unioeste.br/handle/tede/8048

The objective of this study was to determine the apparent digestibility coefficients (ADCs) of protein, energy, calcium, phosphorus, and amino acids, constituents of brewery dry residue (BSG), and to evaluate the effects of different levels of inclusion of this residue in the diet on the growth performance and histology of the intestine and liver of juvenile Nile tilapia (Oreochromis niloticus). For the digestibility study, fish (n = 320; 80/tank; average body weight = 13 ± 5.20 g) were randomly distributed in four 200 L cylindrical fiberglass tanks and fed two diets: a reference diet and a test diet containing BSG. The ADCs of protein (67%) and amino acids were considered high, indicating that the tested ingredient had good absorption. The high fiber content may have contributed to the low energy absorption, generating negative ADC values. Due to its low cost, wide availability, composition, and nutrient digestibility, BSG showed potential for use in diet formulation for Nile tilapia. For the work on performance and histology, a completely randomized design in quadruplicate was adopted, in which 300 juvenile Nile tilapia (5.07±0.97g) were placed in 20 polyethylene tanks with a capacity of 60 L (15 fish/experimental unit) and fed, until apparent satiety, four times a day (07:00; 11:00; 15:00 and 18:00), for 43 days. For this purpose, five experimental isoprotein (320 g protein kg-1) and isoenergetic (3,400 kcal kg-1) diets with increasing BSG concentrations (0, 5, 10, 15, and 20%) were formulated. At the end of the experimental period, zootechnical performance and histology of the intestine and liver were evaluated. The data obtained were subjected to one-way ANOVA and Tukey's test (p<0.05). The dietary inclusion of up to 20% BSG did not affect weight gain (p>0.05). The inclusion of 15% BSG in the diet provided the best results in terms of feed conversion rates and protein efficiency (p<0.05). Fish fed diets containing BSG showed no histological alterations in the intestine and liver. The inclusion of 15% BSG in diets for juvenile Nile tilapia is recommended.