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Observations on the incidence and aetiology of valvular endocarditis in broiler breeders and detection of a newly described taxon of Pasteurellaceae, Avibacterium endocarditidis.

A total of 122 dead broiler breeders randomly selected from a flock showing normal production parameters and covering the age from 44 to 61 weeks were subjected to a comprehensive routine post-mortem examination including examination for lesions of endocarditis. Forty-two hens (34%) showed valvular endocarditis caused by Avibacterium endocarditidis (43%), Enterococcus faecalis (31%), Staphylococcus aureus (5%) and Streptococcus pluranimalium (5%), while growth was not obtained from 17% with the methods used for isolation. Gross lesions associated with the different bacterial pathogens did not allow separation according to pathogens involved. Port of entry and pathogenesis associated with the high prevalence of valvular endocarditis remained speculative. The present findings demonstrated the newly described species of Pasteurellaceae, Avibacterium endocarditidis associated with endocarditis in chickens and confirm previous observations on the prevalence of endocarditis in chickens, partly explaining the slightly increased mortality normally observed in broiler breeders during the last weeks of production.

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