Risk factors for smallholder dairy cattle mortality in Tanzania
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Risk factors for smallholder dairy cattle mortality in Tanzania
disease control problems on dairy farms. In this study we first aimed to identify the major causes of mortality of small- holder dairy cattle in 2 regions of Tanza-.
Article — Artikel
Risk factors for smallholder dairy cattle mortality in Tanzania a*
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E S Swai , E D Karimuribo and D M Kambarage
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ABSTRACT A retrospective cross-sectional study of mortality was conducted on smallholder dairy farms in 2 separate regions (Iringa and Tanga) of Tanzania during the period of January to April 1999. A total of 1789 cattle from 400 randomly sampled smallholder dairy farms (200 each from Iringa and Tanga regions) were included in the study. These animals contributed a total risk period of 690.4 and 653.95 years for Tanga and Iringa, respectively. The overall mortality rates were estimated to be 8.5 and 14.2 per 100 cattle years risk for Tanga and Iringa regions, respectively; 57.7 % of the reported deaths were of young stock less than 12 months old; 45 % of reported young stock deaths (≤12 months old) were due to tickborne diseases, mainly East Coast Fever (ECF) and anaplasmosis. Disease events including ECF were reported to occur in all months of the year. Survival analysis using Cox proportional hazard models indicated that, in both regions, death rate and risk was higher in young stock less than 12 months than in older animals (relative risk RR = 4.92, P
