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Table 1 The number of suckler herds required for sampling (proportional sample) per region in a Leptospiral seroprevalence study in proportion to the percentage of the National Suckler Herd made up by herds in that region

From: Seroprevalence of Leptospira Hardjo in the Irish suckler cattle population

  Suckler cow population Number of herds Total Herds % of National Suckler Herd Proportional Sample Required Number of herds
Region 1 185,665 15,880 19.0 61
Region 2 202,787 18,140 21.7 71
Region 3 186,928 10,470 12.5 40
Region 4 197,100 13,970 16.7 54
Region 5 208,816 11,880 14.2 46
Region 6 205,693 13,290 15.9 51