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Occurrence of Listeria Species in Broilers Pre- and Post-Chilling in Chlorinated Water at Two Slaughterhouses

Forekomsten av Listeria hos slaktkyckling

Abstract

Altogether 323 pooled samples of neck skins from 1615 broilers from 2 processing plants (A and B) were examined for the presence of Listeria species. The broilers were sampled pre-chilling–after leaving the final rinser but before entering the chiller with chlorinated water–and post-chilling–immediately upon leaving the chiller. Free available chlorine in the chilling water varied from 2 to 15 ppm in plant A and was about 10 ppm in plant B. Listeria monocytogenes was only isolated from broilers in plant A sampled post-chilling (58% of 62 samples). L. innocua was isolated from 19% and 39% of broilers sampled pre-chilling in plants A and B, respectively. Post-chilling, L. innocua was isolated from 3% and 6% of samples from plants A and B, respectively.

Sammanfattning

Halsskinn från 1615 slaktkycklingar slaktade på 2 slakterier (A och B) undersoktes på forekomst av Listeria-species. Samlingsprov om 5 halsskinn togs ut omedelbart fore resp. efter passage av vattenkylare (spinchiller). Listeria monocytogenes kunde endast påvisas i prover från slakteri A, och dar endast i halsskinn uttagna efter spinchiller. Av dessa var 58% positiva på L. monocytogenes. L. innocua lsolerades från 19% av proverna från slakteri A och 39% från slakteri Β fore passage av spinchiller. Efter spmchil-lern var frekvensen L innocua 3% resp. 6%. Halten fri obunden klor i kylvattnet varierade mellan 2 och 15 ppm i slakteri A, medan slakteri Β hela tiden holl 10 ppm.

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Acknowledgments

Financial support provided by Medical Inspector Gustav Kjerrulf’s Research Foundation through the recommendations of Swedish Veterinary Association is gratefully acknowledged.

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Loncarevic, S., Tham, W. & Danielsson-Tham, ML. Occurrence of Listeria Species in Broilers Pre- and Post-Chilling in Chlorinated Water at Two Slaughterhouses. Acta Vet Scand 35, 149–154 (1994). https://doi.org/10.1186/BF03548342

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