Portal de Periódicos da CAPES

Artigo Acesso aberto Produção Nacional Revisado por pares

BIBTEX RIS

Egg quality in laying hens exposed to Mycoplasma gallisepticum F-strain attenuated vaccine

2016; Elsevier BV; Volume: 96; Issue: 4 Linguagem: Inglês

10.3382/ps/pew363

1525-3171

Leandro dos Santos Machado, Felipe Faccini dos Santos, Cristina Kimie Togashi, Dayse Lima da Costa Abreu, Jorge Couto Pimentel, Luiz Sesti, Virgínia Léo de Almeida Pereira, Elmiro Rosendo do Nascimento,

Herpesvirus Infections and Treatments

Mycoplasma gallisepticum causes coughing, ocular and nasal discharge, reduction in feed intake, lower and uneven growth, decline in egg production and quality, and increase in mortality. Among the attenuated vaccination strains, MGF can reduce clinical signs and lesions in layer hens, stimulate immune responses of cellular and humoral basis, act as an instrument of competitive exclusion in relation to field strains, and reduce the use of antimicrobials. This study aimed to investigate the effects of attenuated MG F-strain vaccination on egg quality in 3 groups of 30 hens each, being one control and 2 vaccinated. Vaccination was applied by ocular route at 8 and 12 wk of age. Comparisons were made among unvaccinated hens; vaccinated at 8 wk of age; and vaccinated at 8 and 12 wk of age. There were no statistical differences in eggshell thickness and weight among groups. Eggs from twice vaccinated birds yielded a Haugh unit significantly lower than the other groups without affecting egg classification. There was no significant difference in ELISA results between the vaccinated groups.