Morphology, chemical composition, and bacterial concentration of airborne particulate matter in rabbit farms

摘要: Livestock houses are major sources of airborne particulate matter (PM), which can originate from manure, feed, feathers, skin and bedding may contain transport microorganisms. Improved knowledge particle size, morphology, chemical microbiological composition PM in livestock help identify contribute to the development appropriate source-specific reduction techniques. In rabbit production systems, however, there is limited information on specific characteristics. The objective this study was characterise farms terms compositions bacterial concentration different size fractions. Size-fractioned sampled air 2 farms, 1 for fattening rabbits reproductive does, using a virtual cascade impactor, simultaneously collected total suspended (TSP), PM10 PM2.5 Airborne samples were examined by light microscopy scanning electron combined with energy dispersive X-ray analysis. Representative potential also examined. Additionally, methodology extract bacteria developed determine per fraction. Results showed that highly complex especially size. Broken flakes, disintegrated particles feed or faecal material mechanical fracture main farms. Major elements found S, Ca, Mg, Na Cl. Bacterial concentrations ranged 1.7×10 4 1.6×10 6 colony forming units (CFU)/m 3 (TSP); 3.6×10 3.0×10 CFU/m (PM10); 3.1×10 (PM2.5). Our results will improve essential characteristics necessary understand PM’s origin its reduction.