Research On Particulate Matter And Harmful Gas Concentration In Cage Layer House

Livestock breeding is an important part of agricultural development strategy in our country. Large-scale, intensive, modern livestock farming will be the future direction of livestock breeding. The heavy concentration of particulate matter and harmful gas in henhouse will not only hazard human and animal health, but also affect the production efficiency and products quality seriously. Understand the environmental factors and the effects of different management models for the concentrations of particulate matter and harmful gases in henhouse, master the concentration change condition with time at different climatic, will contribute to poultry farms make rational feeding pattern, improve the air quality and production efficiency.According to the climatic characteristics of the test site, this paper selected the rainy season and dry season to collect experimental data. The rainy season test was conducted in June and July, and the dry season test was conducted in December. The experiments used continuous monitoring method to test temperature, relative humidity, particulate matter (TSP, PM1o, PM2.5) and harmful gases (NH3, CO2) concentration in henhouse. Combining them with feeding, manure removal and ventilation management methods under different climatic conditions, and using bivariate correlation to analysis the relationship between temperature, relative humidity and particulate matter concentration, as well as the variation of particulate matter and harmful gas concentrations. Rainy season (high temperatures) regulated henhouse environmental mainly by natural ventilation, which was likely to cause a small ambient to appeared air quality in the henhouse, and reduce production efficiency. Dry season (low temperatures) closed all doors and windows in order to maintain the temperature of the henhouse. It was likely to increase relative humidity inside the henhouse, and a sharp increase for particulate matter and harmful gases concentrations, would reduce indoor air quality, impact animal production performance and health.By analyzing experimental data measured during the rainy season and dry season, the concentration of particulate matter and harmful gases was found subject to many factors. Discounted ventilation, animal activity, temperature, relative humidity would result change for the concentration of particulate matter and noxious gases. The study found that chickens activity had greatest impact to TSP concentration, followed by PM2.5, PM10concentrations minimal impacted. Feeding time (11:00,16:00) and evening light switch time (5:00,21:00) were the most obvious change in particle concentration. The concentration of PM10had a strong correlation with temperature and relative humidity, followed by PM2.5. TSP only had a weak correlation with relative humidity and temperature. Study also found that the correlations between particulate matter concentrations with temperature and relative humidity did not affect by climate. Rainy and dry season inlet (aisle Ⅳ) and outlet (aisle Ⅰ) easily accumulated particulate matter. NH3concentration had great different variation at different locations and climatic conditions. NH3concentration easily accumulated in the middle area at rainy season. In the dry season, the deeper into the henhouse, the lower the concentration of NH3.