STUDIED ON INFECTIOUS BRONCHITIS IN BROILER CHICKENS IN EL-MENIA GOVENORATE | ||
| Veterinary Medical Journal (Giza) | ||
| Volume 54, Issue 2, April 2006, Pages 343-358 PDF (8.99 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/vmjg.2006.379759 | ||
| Authors | ||
| EL KADY F* 1; AZZA EL- SAWAH2; MADABOULY M3; MOHAMED T4 | ||
| 1Prof. and Head of Poultry Diseases Dept. Faculty Vet. Med. Beni Suef Univ. | ||
| 2Ass. Prof. of Poultry Diseases Dept. Faculty Vet. Med. Beni Suef Univ. | ||
| 3Prof. and Head of virology Dept. Faculty Vet. Med. Beni Suef Univ. | ||
| 4Medical Representative | ||
| Abstract | ||
| A total of 986 serum samples were collected from IB non vaccinated 26 Broiler farms in El- Menia; a total population of 135500 bird. All tested farms were ELISA positive for IBV antibodies. The percent of positivity were 42.86, 33.04, 48.37, 31.01, 43.09, 34.01 and 33.86 in samples from Abo- Korkas, Bani- Mawas, El- Menia, Malawy, Maty and Smaloot; respectively. IB virus was successfully isolated by 4 bind passage in SPF chicken embryos, which showed curling and dwarfing and were positive to Dot-ELISA against reference antibodies IBV. Pathogenicity of the obtained virus isolate was studied in both broiler and layer chicken. In broiler chick, pathogenicity was performed in groups aged 1, 7, and 14 days. No mortality was seen in group infected at 14 days of age, while in was 8/25 chicks in both 1 and 7 days. Exanimated tissue sections of trachea, lung and kidney of birds at 4- and 14-days post infection in different age groups revealed severe histopathological changes especially in birds inoculated at 1 and 7 days old as compared with birds inoculated at 14 days old. In layer chicken the isolate resulted in mild respiratory manifestations (sneezing, coughing), decline of egg quantity and quality (rough shell and shell less eggs) 2 weeks after challenge as well as mortality reached 20%. Postmortem examination of succumbed broiler and layer birds revealed severe renal congestion and mild congestion in trachea and larynx. | ||
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