Epidemiological study of mareke's disease in commercial layer flocks in district Toba Tek Singh [Pakistan]
2001
Haq, A.U. (Directorate of Poultry Research Inst., Rawalpindi (Pakistan)) | Siddique, M. | Iqbal, Z.
A study was conducted to assess the prevalence and various risk indicators of Marekþs disease (MD) in commercial layer flocks. A total of 207 layer flocks were studied around Gojra, district Toba Tek Singh from July 1998 to June 1999. Data were collected through cross-sectional epidemiological methods regarding their demography, management practices, prophylactic procedures and concurrent diseases. Prevalence attack rate of MD in this population was 20.77% (43/207). A mortality rate ranging from 5.40 to 11.60 per cent was recorded. The maximum prevalence was observed in birds of 13 to 30 weeks of age. Eleven out of 12 categorical variables had significant relationship with flock MD status. The most important risk factor of the disease was early exposure of immunosuppressive diseases like Gumboro, chicken infectious anaemia and coccidiosis, etc. (P less than 0.01). Other factors were non restricted movement of visitors (P less than 0.01), poor and un-isolated brooding of chickens (P less than 0.01), presence of farm animals and pet birds (P less than 0.01 ). It was also observed that the disease prevalence was quite high on farms owned by laymen in comparison with those managed by educated persons (P less than 0.01).
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