Do the differences in egg contamination, penetration, and resistance against microorganisms among the hen genotypes exist?

Abstract The aim of this study was to evaluate and compare the impact genotype storage conditions (temperature time) on microbiological contamination eggshell quality. There were four genotypes laying hens used, Czech Golden Spotted (CGS), Greenleg Partridge (GP), White Leghorn (WL) commercial hybrid (CH) included. After collection, eggs divided equally into five groups according time (0, 14, 28 days) temperature (5 20°C). analysis included counting colonies forming units (CFU) Escherichia coli (EC), Enterococcus (ENT) total number microorganisms (TNM) surface, membranes in thin albumen. quality determination proportion (SP), thickness (ST), strength (SST), index (SI) surface (SS). Moreover, egg weight (EW) loss (EWL) determined. significant effect found by EC, ENT TNM, TNM albumen EC (all P≤0.05). significantly lowest from WL (4.42 log CFU/eggshell), while CGS (1.22 CFU/eggshell) (1.40 CFU/eggshell). incidence also detected (5.03 Statistically (0.12 CFU/eggshell membranes) CH (0.15 membranes). Regarding genotype, GP (not detected) had with statistically occurrence bacteria EW quality, all parameters affected (P≤0.0001). Also EWL (P≤0.05) (after 21 days storage). be differences microbial among observed hen genotypes. penetration selected EC.