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Abstract
Proventricular homogenates from 3-4 week old broiler chickens that showed sever enlargement of proventriculus, reduced weight gain were collected, homogenized and then passed in SPF-ECE where it posses pathogenicity for ECE that included congested embryos, congested livers and edematous, congested CAMs and embryos mortalities.
Infectious Bronchitis and Infectious Bursal disease viruses were detected in formalin fixed paraffin embedded proventricular sections by IFA
Isolates were serologically identified in CAMs homogenates of proventricular homogenates inoculated SPF-ECE by DOT-ELISA, where 3 samples were positive for IBDV, 5 samples were positive for IBV and 2 samples were positive for both viruses.
The implication of both IBDV and IBV in the induction of proventriculitis in commercial broiler chicks was studied by inoculation of 1 day old commercial broiler Baladi chicks using 3 IBDV strains and 5 IBV strains. Our study revealed that vvIBDV FAY97 IBDV strain was capable of producing proventriculitis grossly and microscopically at 7, 14 and 21 days PI and only microscopically at 28 days PI. However vaccinal IBDV strains (GM97&CH80) showed only microscopical lesions at 21 and 28 days PI with a lesser degree than FAY97 strain.