Carcass hygiene could be improved by essential oils, which should be attributed to their reducing the load of pathogens. Alali et al. (2013) reported that a blend of carvacrol, thymol, eucalyptol, and lemon might reduce the Salmonella heidelberg-positive crops and subsequently reduce the cross-contamination in carcass processing. Venkitanarayanan et al. (2013) reported that a blend of caprylic acid and essential oils (trans-cinnamaldehyde, eugenol, carvacrol, and thymol) reduced Salmonella Enteritidis and Campylobacter Jejuni in cecal contents of birds, which indicates a less likelihood of microbial contamination of poultry meat and eggs. An interesting study by Witkowska and Sowińska (2013) showed improvement in hygiene conditions in poultry house via air disinfectants using thyme and peppermint oils individually as primary components.