Evaluation of quality and chemical spoilage indicators of biological silage produced from chicken waste and its comparison with meat, blood meal and kilka fish meal

Abstract

The aim of this study was to produce biological silage from chicken waste based on fermentation of autogenous bacteria and to evaluate the quality characteristics of the product. In order to produce this product, sampling was performed from selected slaughterhouses in Mazandaran province and biosilage was produced in the form of a one-ton fermenter using autogenous bacteria isolated from the region (fermentation). The final product (dried biosilage) was evaluated qualitatively using standard methods and compared with other sources including meat, blood meal and kilka fish meal (produced by batch method). The results showed that the amount of protein, fat and protein digestibility in the produced biosilage was 59.09%, 21.30% and 87.41%, respectively. The product produced was in a better condition than meat and kilka fish meal in terms of the mentioned indicators. The produced biosilage did not show a significant difference between blood meal in terms of calcium and phosphorus (p>0.05) and was at a lower level (p<0.05) than kilka fish meal and meat. The levels of TVN, PV and TBA in biosilage were measured as 46.56 mg/100g, 4.46 meq/kg and 2.21 mgMDA/kg, respectively. These indices are in a much more favorable condition in the produced product compared to meat and Kilka fish meal. It was further found that the microbial parameters (mold, yeast, coliform, fecal coliform, E.coli) in the samples of meat, blood meal and kilka fish meal were relatively higher compared to biosilage of chicken waste. According to the results of the present study, chicken waste has the ability to be converted into biosilage with desirable characteristics that can be used in agriculture and aquaculture industries.