Qualidade interna e microbiológica da casca de ovos de poedeiras comerciais revestidos com própolis e armazenados por diferentes períodos

Abstract

The objective of this study was to evaluate the interference of the washing process and coating with propolis solution 15% on internal quality and microbial count of shell eggs of laying hens subjected to different storage periods. For the experiment, 1020 eggs from laying the Bovans-White lineage were collected in 30 weeks of age, nine hundred eggs were used for internal quality, the eggs were distributed in a completely randomized design in a factorial scheme 6x5 (egg processing – washless, + 70% washless alcohol spray, + propolis washless solution spray 15%, wash with a mild liquid soap solution; washed + 70% alcohol solution spraying, washed + propolis solution spray 15% x period of storage- 0; 7; 14; 21; 28 days), with five repetitions and 120 eggs intended for microbiological analyzes in a completely randomized experimental design 6x2 processing of eggs - washless; + 70% washless spray alcohol; + propolis washless solution spray 15%; Wash with mild liquid soap solution; washed + 70% alcohol solution for spraying; washed + propolis solution 15% x spray Storage- period 0 to 28 days) with ten eggs per treatment. The results of the internal egg quality showed efficiency (P <0.05) between the different processes and storage periods only for specific gravity, pH of yolk and albumen. The internal quality of the eggs showed interaction (P <0.05) between different processes and storage periods only for specific gravity, pH of the yolk and albumen. Independent of the processing applied, the eggs had increased loss weight and reduction of % yolk and yolk index, Haugh unit and % albumen over storage. As for the coating used, regardless of the storage period, the eggs do not sanitized, but received spray with propolis showed less weight loss when compared to nonsanitized and those only washed and sprayed with alcohol. The counting of mesophilic aerobic microorganisms was lower initially when subjected to spray with alcohol, but this reduction was not maintained throughout the storage period. Growth of fungi, yeasts and bacteria was higher at the end of storage. After 28 days, the eggs were washed and subjected to peeling treatment surface (alcohol or propolis) reduced 100% Staphylococcus aureus count. The sputtering method with propolis solution 15% was not effective in maintaining the internal and microbial quality of shell eggs laying.