The efficacy of live infectious bursal disease vaccines in commercial 10 days old chicks

الملخص EN

The efficacy of four infectious bursa disease virus (IBDV) vaccines including intermediate (D78and intermediate plus (228E, IBD-Blen and Bursa-Vac+) were compared in priming vaccination of 10 days commercial old male layer chicks.

There were different parameters were measured for testing these vaccines including; the immunogenic efficacy, the effect on performance, organ (bursa, spleen, and proventriculus) body weight index as well as histopathologically examination of bursa, spleen, proventriculus and thymus.

Chick was received a dose of 102 EID50 from one IBDV vaccine out of 228E, IBD-Blen or Bursa-Vac+, while D78 dose was 104 EID50.

The results cleared out that all the tested vaccines passed through the maternal derived antibodies 2480.133 + 156.3.

All vaccines stimulate antibody formation as measured by ELISA test.

The used vaccines not affect markedly body weight and feed intake, as there were no significant differences between the control group and the vaccinated ones in the mean body weight and the feed conversion rate.

Furthermore, the bursa: body weight index of vaccinated groups were generally less than those of control one at all intervals, while the spleen and proventriculus spleen : body weight index of vaccinated groups was higher than control on at the end of the observation period.

The used vaccines induced histopathologically changes in bursa, spleen, proventriculus and thymus glands.

These results indicated that all tested vaccine are of value i vaccination of commercial chicks from vaccinated breeders.