Effect of processing on the microbiological quality and safety of chicken carcasses at slaughterhouse
Iratxe Pérez-Arnedo, María J. Cantalejo, Alba Martínez‐Laorden, Elena González‐Fandos
Abstract
Summary Microbiological contamination of chicken meat depends on the conditions under which the animals are reared, slaughtered and processed. The aim of this study was to determine the influence of farm origin and processing stages at slaughterhouse on the microbial safety and quality of chicken. Samples of chicken carcasses from three different farms were taken from a slaughterhouse. Mesophiles, Escherichia coli , coagulase positive Staphylococcci counts, presence of Listeria monocytogenes , Campylobacter and Salmonella were determined at five sampling points: after defeathering, after evisceration, after washing, after chilling and after cutting. Chilling reduced log numbers of mesophiles, coagulase positive Staphylococci and E . coli by 0.85, 1.52 and 2.2 log units, respectively. Salmonella was not detected after chilling. High prevalence of Campylobacter spp was observed at all the stages ranging between 84% and 100%. L . monocytogenes was not detected in chicken carcasses after defeathering. However, it was detected after evisceration and after washing and chilling. The most critical stage for L . monocytogenes contamination was the portioning operation, the prevalence in breast and legs being 88% and 84%, respectively.