Agricultural Engineering Research, Volume 07 (2001)

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Browsing Agricultural Engineering Research, Volume 07 (2001) by Person "Gronauer, Andreas"

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    An Ammonia-Controlled Ventilation System for Fattening Pigs
    (2001) Grotz, Walter; Rathmer, Barbara; Gronauer, Andreas; Schön, Hans
    In farm animal housing, a good stall climate is the prerequisite for ani- mals and humans in the stall to stay healthy. Taking this into account, the legislator has set maximum limits for certain gaseous pollutants such as ammonia (NH3 ) in the calf- and pig husbandry decrees. At the Bavarian Research Center for Agricultural Engineering, an ammonia-controlled ventilation system with NH3 as an additional regulation variable besides the temperature was developed in cooperation with ventilation compa- nies and successfully tested in a stall for fattening pigs. Low-cost NH3 sensors, which were tested during the project at a gas dilution station in the laboratory and in practical trials in the stall, currently do not yet seem suitable for long-term, reliable use in an ammonia-controlled ven- tilation system.
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    Measurements of Odour Emissions

    Use of Means of Olfactometry and Chemical Sensor Arrays for the Comparison of Different Housing Systems for Fattening Pigs

    (2001) Maier, Barbara; Rathmer, Barbara; Riess, Gisbert; Zeisig, Hans-Dieter; Gronauer, Andreas
    Due to the increasing sensitivity of the population, the measurement of undesirable odours from agricultural animal husbandry has become a problem which may no longer be neglected. For this reason, objective odour registration is necessary. In this contribution, the results of a comparison of different housing sy- stems for fattening pigs by means of olfactometry and a multisensor array are documented. The great advantage of the chemical sensor array measurements over olfactometry mainly resides in the continuous regi- stration of measurement values as compared with the small number of samples collected during olfactometric measurements. A long-term com- parison of a conventional warm house and two different outdoor climate stall compartments on the same farm allowed the odour emissions of the different housing systems to be assessed. During three measuring periods distributed over one year, olfactometric measurements were taken daily. In addition, continual chemical sensor array measurements were con- ducted during one of the observation periods. As compared with the con- ventional temperature-insulated, partially slatted stall with forced venti- lation, a reduction of the odour emission potential of the outdoor climate experimental compartments with partially slatted floors or litter was pro- ved during all three measuring periods.