Significance of paroviruses, entero‐like viruses and reoviruses in the aetiology of the chicken malabsorption syndrome

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Abstract
Specific‐pathogen‐free White Leghorn chickens and commercial broilers were inoculated orally at 1 day of age with different intestinal preparations containing a chicken parvovirus, an entero‐like virus associated with a reovirus from field materials, or the entero‐like viruses and reovirus alone. Despite viral multiplication in inoculated birds, no clinical signs or growth retardation were observed in SPF and broiler chickens infected with the reo or parvo viruses. Abnormal faeces and reduction in weight gains were observed after infection with the field materials and the entero‐like viruses. Some easily sedimentable particles could be involved with the entero‐like virus in the aetiology of ranting syndrome. Proventriculitis was present in chickens inoculated with one of the field materials and with the entero‐like virus isolated from that material. Specific‐pathogen‐free White Leghorn chickens were as susceptible as commercial broiler chickens to weight gain depression after oral inoculation with crude homogenates at 1 day of age.