3.7 Antimicrobial residues assessment
The Disc Diffusion Test revealed antimicrobial residues with ≥2 mm
diameter on MHA plates in 48.4% (92/192) urine samples of intensively
managed beef cattle farms, while 34.4% (n=66/192) urine samples in the
semi-intensive cattle farms have antimicrobial residues. The statistical
analysis revealed that there was a significant difference between the
samples taken from the two production systems
(X2 = 7.25, df = 2, p=0.007) (Table 5).