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Kitandu A., R. Juranová, I. BedáÀová:Influence of Vaccination of Hens with Attenuated Oocysts of Eimeria tenella, E. necatrix, E. acervulina and E. maxima on the Protection of Offspring against Eimeria Infection. Acta Vet. Brno 2005,74: 585-593. The feasibility of protection of offspring against Eimeria infection via maternal or passive derived immunity from hens (layers) vaccinated with attenuated oocysts of Eimeria acervulina, E. maxima, E. tenella and E. necatrix was investigated. Gross lesion scores on the basis of pathological changes and oocyst count methods were used in the experiment. Seven hens (layers) (Group A) and eighty hens (layers) (Group B) were orally vaccinated with 30,000 to 50,000 oocysts of attenuated Eimeria tenella, E. acervulina, E. maxima and 10,000 oocysts of attenuated E. necatrix. A second vaccination with the same dose was given to group B hens, and seven control hens (Group C) were not vaccinated. Offspring of three groups of hens (layers) were challenged with 10,000 oocysts of virulent lines of Eimeria tenella, E. acervulina, E. necatrix and E. maxima. Offspring of revaccinated hens showed significantly reduced lesion scores (p < 0.01) after challenge with E. tenella, E. necatrix, E. acervulina and E. maxima compared to offspring of non vaccinated hens. Offspring of vaccinated hens showed significant reduction in lesion scores (p < 0.01) with E. maxima and (p < 0.05) with E. necatrix compared to offspring of non vaccinated hens (layers). Progeny of revaccinated hens also showed reduced oocyst excretion with (0.3 ± 0.1) ×106 oocysts of E. tennella, (0.3 ± 0.1) ×10 6

acta veterinaria brno

Influence of vaccination of hens with attenuated oocysts of Eimeria tenella, E. necatrix, E. acervulina and E. maxima on protection of offspring against Eimeria infection