Abstract
An experiment was designed to evaluate the ability of various rendering processes used in European Community (EC) Member States to deactivate the BSE or scrapie agent. Pilot scale rendering equipment was used to simulate processes that are currently being used within the EC. Additional processes that could be of use in the future were also evaluated. The selection of the different rendering systems and the process conditions, were the subject of exhaustive preliminary discussion involving government and industry representatives. The first experiment used brain material from cattle clinically suspected of having BSE. For each individual process, brain material was mixed with carcase, bones and offal, and this mix was then subjected to the appropriate test conditions. The aim of all test runs was to attain the target conditions set down in the experimental protocol. The experimental protocol defined appropriate parameters for the individual tests eg, raw material; fat ratio, particle size, temperature, time, and atmospheric pressure. Processed material was subsequently prepared into either meat and bone meal or animal fat (tallow). The samples are currently being tested for BSE infectivity using mouse bioassay. A second experiment is planned using brain material from British sheep with scrapie.
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