Nature of the taking Number of samples
Manual milking Milkingmachine Total
Number of cows 17 22 39
Numbers of milk samples 65 85 150
Numbers of anal swabs 17 22 39
Numbers of vaginal swabs 13 22 35
Number of swabs 0  2 2
Number of swabs on the hands of the milker  3 0 3
Number of swabs on creams Antibiotics 12 0 12
Numbers oflitter samples 0  3 3
Table 1: Sampling plan.