Mold and Microbial-Contamination of Dust Deposition in Cowsheds for Heifers and Dairy-Cows

Veterinarni Medicina 39, 1994, 245-253

A long-term observation of the microbial contamination of dust deposition per 1 cm2 area and 24 hours with special respect to mold detection was performed in a section of the cowshed for management of 1 200 heifers with loose litterless housing, in two sections for management of 1 300 cows with loose litter housing and in two sections of a small stable for 20 cows with tie litter stalls. The lowest average counts of microbes intercepted in the samples of dust deposition on MPA and micrococci intercepted on blood agar with 10% NaCl were determined in the sections of the small stable for 20 dairy cows. The lowest counts of L+ and L-microbes intercepted on End's agar from dust deposition were found out in the section of the large-capacity cowshed, while the mold counts on Czapek-Dox agar were highest in these sections of the large-capacity cowshed. According to our conclusions this is in agreement with the methods of litter use and amount per dairy cow in both technologies of dairy cow housing. Toxinogenic species of molds were identified in dust deposition, these species occurred frequently: Aspergillus fumigatus, A. glaucus, Aspergillus sp., Penicillium sp., Geotrichum sp., Absidia sp., Cladosporium sp. A relationship between the detection of molds in dust deposition and the molds of contaminated feed and straw for bedding has been discovered. Dust deposition is an important secondary source of contamination of the stable environment with microbes and molds due to aerogenic action of infectious agents during spread of respiratory infections of housed animals, especially of mycoses

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