Risk to public and/or animal health of the treatment of dead-in-shell chicks (Category 2 material) to be used as raw material for the production of biogas or compost with Category 3 approved method

animal by-products, hatchery, dead-in-shell chicks, biogas, compost, hazards, thermal inactivation
First published in the EFSA Journal
13 November 2015
Adopted
22 October 2015
Type
Scientific Opinion

Abstract

In 2011, EFSA assessed the risk posed by the possible use of dead-in-shell chicks for the production of processed pet food. In 2014, the European Commission asked for an update on the risk posed by the same material but as raw material for the production of biogas and compost according to standard transformation parameters normally used for Category 3 material. According to current European Union legislation, the following processing method was considered: maximum particle size before entering the processing unit: 12 mm; minimum temperature in all material in the unit: 70°C; and minimum time in the unit without interruption: 60 minutes. A list of pathogens potentially present in the material to be treated was compiled and available literature data were used to assess the ability of the processing methods to inactivate the most resistant pathogens identified. Spores of Clostridium botulinum were identified as the most resistant hazard potentially present in the material to be processed. Circovirus and parvovirus and Enterococcus faecium were considered the most heat-resistant viruses and non-sporulating bacterium, respectively. Moreover, depending on storage conditions, the formation of bacterial toxins is possible. The processing methods considered were therefore assessed for their ability to inactivate those hazards. The probability of survival of pathogens related to the use of dead-in-shell chicks subjected to the treatment process was considered to be extremely low for the heat-sensitive pathogens that could be present in the material, which include bacteria such as Salmonella and avian influenza virus. However, this treatment is unable to sufficiently inactivate other relevant hazards (e.g. bacterial spores, thermoresistant viruses and certain bacterial toxins). 

Panel members at the time of adoption

Ana Allende, Declan Bolton, Marianne Chemaly, Robert Davies, Pablo Salvador Fernández Escámez, Rosina Gironés, Lieve Herman, Kostas Koutsoumanis, Roland Lindqvist, Birgit Nørrung, Antonia Ricci, Lucy Robertson, Giuseppe Ru, Moez Sanaa, Marion Simmons, Panagiotis Skandamis, Emma Snary, Niko Speybroeck, Benno Ter Kuile, John Threlfall, and Helene Wahlström.
Panel on Biological Hazards
Contact
biohaz [at] efsa.europa.eu
doi
10.2903/j.efsa.2015.4306
EFSA Journal 2015;13(11):4306
Question Number
On request from
European Commission