Production of Microbial Silages From Animal Wastes as Fishmeal Replacer in the Aquaculture Diets

Abstract

The experiment was carried out to produce and assess the storage quality of microbial silages from three animal wastes namely fish offal (FO), chicken gut (CG) and shrimp head (SH) using yoghurt as dietary fishmeal (FM) replacer for aquaculture. There was prevalent relationship between decreasing of pH and silage process that was analyzed by One-Way ANOVA as the alpha level (p<0.05). Ensilage process was completed within 14-21 days and three liquefied silages of desired pH level (<4.5) were obtained. The crude protein content found was highest in shrimp head silage (31%) followed by chicken gut silage (30%) and fish offal silage (16%) while highest crude fat was found in fish offal silage (69%) followed by shrimp head silage (53%) and chicken gut silage (43%) respectively. Total amount of essential amino acids (EAA) in chicken gut silage was found highest (9.33 g.100 -1 protein) followed by shrimp head silage (8.91 g.100 -1 protein) and fish offal silage (4.70 g.100 -1 protein) respectively. During 90 days storage, pH was found to be stabilized below 4.5, no change in color and smell and no sign of putrefaction in the produced silages were seen. The results of proximate composition including EAA reveal that produced silages have potentials to be used as protein supplement in aquafeed.