A mathematical model for assessing the economic effects of disease in broiler chicken flocks     

Oyebanjo Dayo Oyekole 《Preventive veterinary medicine》1984,3(2):151-158

A deterministic mathematical model is developed for assessing the economic effects of disease outbreaks in broiler chicken flocks. Using the model, this paper estimates the very high cost of disease which occurred on a poultry farm in Ibadan. Nigeria and indicates the wide variety of accurate date required when trying to obtain precise figures for the true financial costs of disease.  相似文献   

Prevalence and incidence of bovine trypanosomosis in an agro-pastoral area of southwestern Burkina Faso     

Guiguigbaza-Kossigan Dayo  Zakaria Bengaly  Samir Messad  Bruno Bucheton  Issa Sidibe  Bila Cene  Gérard Cuny  Sophie Thevenon 《Research in veterinary science》2010,88(3):470-477

The present study was conducted to determine the prevalence and incidence of trypanosomosis and to investigate some factors influencing them in an agro-pastoral area of southwestern Burkina Faso. A total of 363 crossbred cattle (Baoule-zebu peul), which were bred under natural trypanosomosis challenge, were monitored monthly for parasitaemia, packed cell volume (PCV) and serological analyses over 2 years. The parasitological prevalence estimated at the beginning of the survey using the buffy coat technique (BCT) was 7.54%. As much as 66.7% of all trypanosome infections were due to Trypanosoma vivax, 23.8% due to Trypanosoma congolense and 9.5% due to T. vivax/T. congolense mixed infections. The monthly serological incidence varied from 0.29% to 19.29%.The season was the most important factor influencing the serological prevalence and incidence and the animal PCV. The dry hot season is associated with increasing seroprevalences and incidences and consequently a decreasing average of PCV. In addition, an important spatial heterogeneity was observed.  相似文献