Environmental study of poultry confinement buildings

Area of Science:

• Environmental Science
• Occupational Health
• Agricultural Engineering

Background:

• Poultry confinement buildings can harbor various airborne contaminants.
• Understanding the levels and characteristics of these contaminants is essential for worker safety and animal welfare.

Purpose of the Study:

• To characterize gas and particulate contaminants in three poultry confinement buildings.
• To determine particle size distribution and endotoxin levels in relation to dust.
• To assess airborne concentrations of ammonia, carbon dioxide, and other gases.

Main Methods:

• Environmental measurements were conducted in active areas of poultry confinement buildings.
• Cascade impactors were used to measure particle size distribution.
• Gas concentrations (ammonia, CO2) and airborne microbial levels (bacteria, fungi) were quantified.
• Endotoxin analysis was performed on dust samples across different size fractions.

Main Results:

• Average levels of total dust (4.4 mg/m3) and respirable dust (0.24 mg/m3) were recorded.
• Ammonia averaged 25 ppm in active areas, but reached 170 ppm in unventilated spaces.
• Airborne bacteria and fungi concentrations were approximately 1.5 x 10(5) and 1.0 x 10(4) CFU/m3, respectively.
• Endotoxin was detected in all particle size ranges, with higher concentrations per unit of dust in smaller particles (<3.5 microns).

Conclusions:

• Poultry confinement environments contain measurable levels of dust, ammonia, and endotoxins.
• Endotoxin presence across particle sizes highlights potential respiratory health concerns for workers.
• Measured endotoxin levels were generally lower than previously reported in similar operations.