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 tick-borne diseases, mainly East Coast Fever (ECF) and anaplasmosis