Effects of Microbial Aerosol in Poultry House on Meat Ducks' Immune Function.

Results The concentrations of microbial aerosol and noxious gas under different hygienic conditions Over time, the concentrations of airborne aerobe, airborne fungi, airborne gram-negative, airborne endotoxin, and NH 3 showed an overall trend of increase with the deteriorating of hygienic conditions, however, concentration of NH 3 in each group was lower than the poultry harmless criterion (10 ppm, GB/T 18407.3–2001), and H 2 S was not found in all groups (Table 2 ; Yu et al., 2016 ).

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