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Title: In-shed heaping of broiler litter to inactivate poultry pathogens before reuse
Contributor(s): Walkden-Brown, Steve W (author)orcid ; Islam, Afm Fakhrul (author); Wells, Ben (author); Burgess, Susan (author)
Publication Date: 2012
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Abstract: Reusing poultry litter for multiple batches of broiler chickens risks transfer of pathogens between batches. On two commercial farms we investigated the effects of various litter heaping treatments for 9-10 days between batches of chickens (heaping or windrowing, with or without turning at day 3-4, or litter turning only) on temperature profiles and loss of infectivity of litter for key viral pathogens and coccidia. Treatments within farm were replicated in two sheds. Temperature was monitored continuously at depths of 0, 25, 50 and 75-100 cm. On days 0, 3-4, 6-7, and 9-10, representative litter from these depths was collected, pooled and infectivity tested using a published chick bioassay measuring seroconversion or oocyst production in chicks exposed to litter in isolators. Temperature varied markedly with depth and time. Mean below surface maxima of 65-68 °C (Farm 1) and 55-63 °C (Farm 2) were reached more rapidly at 25 cm (3-4 days) than 50-100cm (7-10 days) with the highest peak temperatures recorded at 50cm. Temperatures were higher in heaps than windrows and turning did not increase temperature. Coccidial infectivity was undetectable by day 3. Fowl adenovirus infectivity was mostly undetectable by days 6-7 while chicken infectious anaemia virus and infectious bursal disease virus infectivity were undetectable by days 6-10. Marek's disease virus showed reduction in infectivity with significant infectivity remaining at days 9-10. This work confirmed litter transmission of several viral pathogens and showed that heaping of litter between batches will markedly reduce the infective load of most pathogens evaluated, and potentially eliminate some.
Publication Type: Conference Publication
Conference Name: WPC 2012: XXIV World's Poultry Congress, Salvador, Brazil, 5th - 9th August, 2012
Conference Details: WPC 2012: XXIV World's Poultry Congress, Salvador, Brazil, 5th - 9th August, 2012
Source of Publication: WPC 2012 Book of Abstracts, p. 307-310
Publisher: Cambridge University Press
Place of Publication: United Kingdom
ISSN: 0043-9339
Field of Research (FOR): 070205 Animal Protection (Pests and Pathogens)
HERDC Category Description: E2 Non-Refereed Scholarly Conference Publication
Series Name: World's Poultry Science Journal
Series Number : Supplement 1
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Appears in Collections:Conference Publication
School of Environmental and Rural Science

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