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The inactivation of a bovine enterovirus and a bovine parvovirus in cattle manure by anaerobic digestion, heat treatment, gamma irradiation, ensilage and composting

Published online by Cambridge University Press:  19 October 2009

H. D. Monteith ,
E. E. Shannon  and
J. B. Derbyshire
H. D. Monteith
Affiliation:
Canviro Consultants Ltd, 178 Louisa St, Kitchener, Ontario, CanadaN2H 5M5
E. E. Shannon
Affiliation:
Canviro Consultants Ltd, 178 Louisa St, Kitchener, Ontario, CanadaN2H 5M5
J. B. Derbyshire
Affiliation:
Department of Veterinary Microbiology and Immunology, University of Guelph, Guelph, Ontario, CanadaNIG 2W1
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A bovine enterovirus and a bovine parvovirus seeded into liquid cattle manure were rapidly inactivated by anaerobic digestion under thermophilic conditions (55°C), but the same viruses survived for up to 13 and 8 days respectively under mesophilic conditions (35°C). The enterovirus was inactivated in digested liquid manure heated to 70°C for 30 min, but the parvovirus was not inactivated by this treatment. The enterovirus, seeded into single cell protein (the solids recovered by centrifugation of digested liquid manure), was inactivated by a gamma irradiation dose of 1·0 Mrad, but the parvovirus survived this dose. When single cell protein seeded with bovine enterovirus or bovine parvovirus was ensiled with cracked corn, the enterovirus was inactivated after a period of 30 days, while the parvovirus survived for 30 days in one of two experiments. Neither the enterovirus nor the parvovirus survived composting for 28 days in a thermophilic aerobic environment when seeded into the solid fraction of cattle manure. It was concluded that, of the procedures tested, only anaerobic digestion under thermophilic conditions appeared to be a reliable method of viral inactivation to ensure the safety of single cell protein for refeeding to livestock. Composting appeared to be a suitable method for the disinfection of manure for use as a soil conditioner.

Type
Research Article
Information
Journal of Hygiene , Volume 97 , Issue 1 , August 1986 , pp. 175 - 184
Copyright
Copyright © Cambridge University Press 1986

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