The use of sorbents on the basis of humic acids to reduce ammonia levels in stable environment
1999
Suchy, P. | Herzig, I. | Pisarikova, B. (Vyzkumny Ustav Veterinarniho Lekarstvi, Brno (Czech Republic))
In a series of experiments performed in experimental stables and aimed at testing the use of humic acids for the reduction of free ammonia level, 3 % of sodium humate were administered in the ration for pigs in two subsequent periods. At the same time, nitrogen balance (the amount of nitrogen intake by feed and excretion by faeces and urine) was monitored. In another two periods 1 kg of ground humic substances was applied twice a day on the floor of experimental stable, i.e. 150 g/square m/day. The levels of free ammonia were recorded daily at 7 a.m. and 2.30 p.m. in stables throughout the whole experimental period. Air temperature and relative humidity were measured in the stables as well as outdoor temperature and atmospheric pressure. Significantly lower (P/-0.05) average levels of free ammonia (6.9 +/-1.58 ppm) were found in the stable where sodium humate was administered, compared with the stable without humate administration (10.4+/-3.35 ppm). However, this result was not confirmed in period II. Nonsignificantly lower levels of free ammonia (6.4+/-1.28 ppm) were found in the stable without humate administration compared with the stable with sodium humate administration (7.6+/-2.00 ppm). In period III significantly lower (P/- 0.05) levels of free ammonia (6.5+/-1.12 ppm) were found in the stable where ground humic substances were applied on the floor compared with the control stable (11.0+/-4.43 ppm). Like in period IV, significantly lower (P/-0.01) average levels of free ammonia (7.2+/-2.44 ppm) were recorded in the experimental stable compared with the control one (12.0+/-2.89 ppm).
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