Eggshell apex abnormalities in a free-range hen farm with mycoplasma synoviae and infectious bronchitis virus in Rio de Janeiro state, Brazil

Revista Brasileira de Ciência Avícola

Fc Dos Santos²  Mdm Brandão²  Cc Da Silva²  Ls Machado²  Mv Soares¹  Ml Barreto¹  Er Do Nascimento²  Vla Pereira² 

[1] ,Programa de Pós-graduação em Higiene Veterinária e Processamento Tecnológico de Produtos de Origem Animal

关键词: Eggs;    mycoplasm;    egg defects;    egg abnormality;    economic loss;   

DOI  :  10.1590/1516-635x1602101-104

来源: SciELO

【 摘 要 】

A farm with 3,000 free-range hens between 24 and 65 weeks of age was investigated. These hens were separated in small flocks of 400 to 700 birds, presenting 10 to 23% egg production reduction. Twenty serum samples were collected during the period of drop in egg production and three weeks later for the investigation of Mycoplasma synoviae (MS), M. gallisepticum (MG) and Infectious Bronchitis Virus (IBV) antibodies using ELISA. At the time of the second collection, egg production had resumed to normal levels; however, with 10.23% of the eggs showed eggshell abnormalities limited to the apex. Eggshell strength was significantly different between normal and those with eggshell apex abnormalities, but not other egg-quality parameters. ELISA tests showed that MS and IBV titers increased during the evaluated period. MS infection was confirmed by culture and by PCR of tracheal swabs. All samples were negative for MG by ELISA and PCR. Further studies with larger samples to ensure the occurrence of this disease in industrial layer flocks in Brazil are under way.

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