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      NILE TILAPIA FED ENZYME COMPLEX ADDED AT DIFFERENT LEVELS AND PROCESSING STEPS Translated title: TILÁPIA DO NILO ALIMENTADA COM COMPLEXO ENZIMÁTICO ADICIONADO EM DIFERENTES NÍVEIS E ETAPAS DO PROCESSAMENTO

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          Abstract

          ABSTRACT Enzyme activity in solid-state fermentation complex added to diets before and after extrusion process and its influence on Nile tilapia (Oreochromis niloticus) performance were evaluated. The following enzymes were analyzed: b-glucosidase, pectinase, xylanase, endoglucanase, amylase, protease, and phytase. The fish were fed five experimental diets: a control diet (without enzyme), two test diets supplemented before extrusion (400 and 800 ppm SSF), and two test diets after extrusion or “on top” (400 and 800 ppm SSF). The experiment had a completely randomized design with four replicates and seven fish per tank. Average initial weight was 10.37 ± 0.95 g, and fish were fed four times a day to satiation for 56 days. The following performance parameters were evaluated: final weight, weight gain, feed conversion, survival, specific growth rate, and body composition. The results were compared using ANOVA and Tukey’s test at p<0.05. All the enzymes showed partial or total losses of activity when subjected to the extrusion process, except phytase. No differences were observed for survival, water quality parameters, and body composition. On-top inclusion provided a better performance, which is observed through increases in final weight, weight gain, and feed conversion. As a result, 800 ppm of enzyme complex SSF should be added "on top", that is after extrusion, to improve tilapia performance and, consequently, contribute to the fish farming financial efficiency.

          Translated abstract

          RESUMO As atividades das enzimas do complexo enzimático SSF (solid-state fermentation) adicionado à ração antes e após o processo de extrusão e a influência no desempenho de tilápias do Nilo (Oreochromis niloticus) foram avaliadas. Foram selecionadas as seguintes enzimas para análise: b-glicosidase, pectinase, xilanase, endoglucanase, amilase, protease e fitase. Os peixes foram submetidos a cinco tratamentos: ração sem adição de enzima, com adição de 400 ppm de SSF antes da extrusão, com 800 ppm de SSF antes da extrusão, 400 ppm de SSF adicionados “on top” após a extrusão e 800 ppm de SSF adicionados “on top” após a extrusão. O experimento teve um delineamento inteiramente casualizado com quatro repetições, contendo sete peixes por aquário. O peso médio inicial foi de 10,37 g ± 0,95, sendo alimentados quatro vezes ao dia, até a saciedade, durante 56 dias. Avaliou-se: peso inicial, peso final, ganho de peso, conversão alimentar, sobrevivência, taxa de crescimento específico e composição corporal. Os resultados foram comparados utilizando-se ANOVA e teste de Tukey a p<0.05. Todas as enzimas perderam atividade enzimática parcial ou total quando submetidas ao processo de extrusão, exceto a fitase. Não foram observadas diferenças entre a sobrevivência, parâmetros de qualidade da água e a composição corporal. A inclusão “on top” proporcionou um melhor rendimento, observado através de melhorias no peso final, ganho de peso e conversão alimentar. Concluiu-se que, 800 ppm de SSF deve ser adicionado "on top", após a extrusão, para proporcionar um melhor desempenho em tilápias, e consequentemente a eficiência financeira da produção.

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          Most cited references24

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          Environmental assessment of enzyme use in industrial production – a literature review

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            A stable starch substrate for the determination of amylase in serum and other body fluids.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rcaat
                Revista Caatinga
                Rev. Caatinga
                Universidade Federal Rural do Semi-Árido (Mossoró, RN, Brazil )
                0100-316X
                1983-2125
                March 2018
                : 31
                : 1
                : 171-179
                Affiliations
                [3] Rio Pomba Minas Gerais orgnameInstituto Federal do Sudeste de Minas Gerais Brazil mouraguilherme@ 123456yahoo.com.br
                [4] Viçosa Minas Gerais orgnameUniversidade Federal de Viçosa Brazil eduardoalanna@ 123456yahoo.com.br
                [2] Diamantina Minas Gerais orgnameUniversidade Federal dos Vales do Jequitinhonha e Mucuri Brazil marcelogaspary@ 123456gmail.com
                Article
                S1983-21252018000100171
                10.1590/1983-21252018v31n120rc
                de17e4c0-394d-4ac5-a0aa-239ec49d0bf9

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 29, Pages: 9
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