This study was conducted to investigate
the bacterial contamination of air and the surface of
equipment and facilities in hatchery. In addition, the
inhibitory effects of formaldehyde application meth-
ods on aerosol bacterial counts in the hatchers were
also investigated. In the operating hatchers, the con-
tamination of air by aerobic bacteria, coliform, and
fungi was high, measuring over 300 cfu/63.6 cm2. In
the egg sorting room, contamination was moderate,
whereas in the remaining sampling sites such as the
setter room, candling-transfer room, and chick count-
ing room, contamination was minimal, measuring less
than 10 cfu/63.6 cm2 for aerobic bacteria, 5 cfu/63.6
cm2 for coliform, and 2 cfu/63.6 cm2 for fungi.