Physical, Chemical and Biological Hazards Present at Meat Processing Facilities

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3.3.6 Chilling

The growth of microbiological organisms is highly affected by temperature. The microorganisms that may be present on meat products are mesophilic pathogens that grow at temperatures between 7 and 37°C (AFFCO, 2003). This growth range is referred to as the mesophile window, or the range where enteric pathogens are able to proliferate readily (AFFCO, 2003). Meat processing plants are therefore able to adequately control bacterial growth during the production process by regulating the product temperature. MPI imposes regulations for carcass and product cooling where all meat processors follow standard time/temperature regimes and/or meat Process Hygiene Index (NZFSA, 2004). The standard time/temperature regimes were derived from good manufacturing practice, which have been shown to produce microbiologically safe products. At AFFCO Horotiu, a preservation programme is in place where cooling of carcasses and product immediately after slaughter has been reduced to 7°C in order to meet compliance with industry standards.

After the immediate post-slaughter period, carcasses are refrigerated if they are not undergoing hot boning. Carcasses may be transferred to chillers or held in the same room as that used for assembly. The critical factor is the application of refrigeration to achieve the cooling performance standard described in this section (NZFSA, 2004). Unless otherwise approved, the air temperature shall be no warmer than 10°C, and chillers shall reduce the deep meat temperature to 7°C within 24 hours of the carcass leaving the slaughter floor or 10 °C within 24 hours of the carcass leaving the slaughter floor when all the carcasses are going to be frozen in carcass form (NZFSA, 2004). After being reduced...

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Terlouw, E.M.C., Arnould, C., Auperin, B., Berri, C., Le Bihan-Duval, E., Deiss, V., Lefervre, F., Lensink, B.J., & Mounier, L. (2008). Pre-slaughter conditions, animal stress and welfare: current status and possible future research. Animal, 2(10), 1501-1517.

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