Physical-chemical and microbiological characteristics of acid silage of fish subjected to two processes of acidification and different storage periods

• Autor(a) principal: Moisés Sena Pessoa
• Data de Publicação: 2018
• Outros Autores: Flávia Oliveira Abrão, Eduardo Robson Duarte, Antônio Cléber da Silva Camargo, Daniel Emygdio Faria Filho
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFMG
• Texto Completo: http://hdl.handle.net/1843/50695
• topic: Silagem; Tilápia (Peixe); Ácido lático; Ácido acético

This research aimed to evaluate the physical-chemical and microbiological characteristics of acid silage from whole fish submitted to two acidification processes and five periods of storage, in a completely randomized design. The acidification processes were acetic acid (5 %.biomass-1) and lactic acid (5 %.biomass-1) and the storage periods were 1, 7, 14, 21 and 28 days. The silage materials were stored in the BOD incubator (biological oxygen demand incubator) at 37°C for 28 days. The culture, quantification, and isolation of Enterobacteriaceae, Staphylococcus spp., Lactobacillus spp., filamentous fungi, and yeasts were performed. After 28 days the chemical analyzes of both silages were performed and compared with the raw material. The pH of the silage with lactic acid was significantly lower (P<0.05) than that produced with acetic acid. Enterobacteriaceae were only detected for raw material samples. There was a development of filamentous and yeasts up to seven days for both silages. Regression analysis estimated that the optimal time for stabilization of lactic silage acid is an average of 7.6 days, showing to be efficient for the reduction of Staphylococcus spp. population. Both silages had high protein contents (45-56 %) and would be a good alternative for feeding non-ruminants. This work represents the first study that evaluates the production of fish silage with lactic acid and the results indicate lower pH (3.7) and faster reduction of Staphylococcus spp., when compared to fish silage with acetic acid.