Open AccessFeeding and bedding materials as sources of microbial exposure on dairy farms.
Author(s) -
Marjut Kotimaa,
Lauri Oksanen,
Pentti Koskela
Publication year - 1991
Publication title -
scandinavian journal of work, environment and health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.621
H-Index - 103
eISSN - 1795-990X
pISSN - 0355-3140
DOI - 10.5271/sjweh.1726
Subject(s) - hay , mesophile , straw , silage , bedding , environmental science , biology , agronomy , zoology , botany , bacteria , genetics
Hay, grain, silage, and bedding are the sources of mold dust in agriculture. The aim of the present study was to evaluate the effect of different farming methods on exposure to airborne microbes. The study material comprised 50 silage, 54 hay, 47 grain, and 70 bedding samples taken on 18 farms in the beginning, middle, and end of the indoor feeding season. The modified wind-tunnel technique and six-stage impactors were used to determine the number of mesophilic bacteria, xerophilic fungi, mesophilic fungi, thermotolerant fungi, and thermophilic actinomycetes liberated from each material. Baled hay and straw liberated the largest amounts of microbes. Hay, except when dried in storage, liberated great numbers of fungal spores. The proportion of respirable airborne microbe-bearing particles was greatest in the highest concentrations. Theoretically, choosing the best possible alternative work methods could diminish exposure to microbes to one-tenth of the present level.