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  • Title: [Correlation between concentration of ammonia in the air of pigsties and the activity of fattening pigs in deep litter].
    Author: Hoy S.
    Journal: Dtsch Tierarztl Wochenschr; 1995 Aug; 102(8):323-6. PubMed ID: 8591764.
    Abstract:
    Results of continuous measurements of ammonia during three rounds with a total number of 297 days (appr. 7000 hour-values) and of behavioural investigations over 576 hours in two rounds at the begin, in the middle and at the end of fattening period have shown a high congruence of both variables (concentrations of ammonia; percentage of using self-feeders as indicator for animal activity) over 24 hour-cycle with a characteristic biphasic dynamics and two periods of increased values (after morning feeding between 7 and 9 a.m. and in the afternoon between 1 and 3 p.m.). The hour-averages of both parameters demonstrated a high significant positive correlation (r = 0.83; p < 0.01): concentration of ammonia is increasing with increasing animal activity. To evaluate concentration or emission of ammonia under the view point of animal or environmental hygiene it is necessary to consider the dynamics of NH3-values in choosing representative measurement points or periods.
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