The aim of this experiment was to analyze the changes of ammonia production and greenhouse gases in frequent type of stables for dairy cows in winter. Two analyzed stables were situated side by side, one of which is after reconstruction of housing and ventilation technology and the second stable remained in original state. Variances of the mass concentration of gases differed significantly (P < 0.05), and the production of all gases monitored in winter was higher in the original stable. The average ammonia production was 2.45 ± 1.9 mg/m³in the reconstructed stable, while in the original stable it was 5.1 ± 2.7 mg/m³. Average CO₂ production was nearly twice higher in the unreconstructed building, namely 2,045.5 ± 862.3 mg/m³, while in the renovated facility it was 1,254.2 ± 416.2 mg/m³(P < 0.05). The described type of reconstruction provides increased comfort for animals, which gives rise to a significant increase in production parameters, but also allows up to twice the reduction of hazardous pollutants such as CO₂ and ammonia

Lendelová J., Žitňák M., Bošanský M., Šimko M., Piterka P. (2016): Testing of property changes in recycled bedding for dairy cows. Res. Agr. Eng., 62 (Special Issue): S44-S52.The aim of this study was to analyse the change of the characteristics of different types of organic bedding in deepened stall base cubicles for dairy cows. The research was carried out in barn 1 using separated raw manure solids, in barn 2 using drum composted manure solids and for comparison a barn 3 was chosen, which used traditional straw as a bedding material. Dry matter of separated raw manure and drum composted recycled manure solids in sample 1 collected after 2-3 hours of bedding acclimatization in the stable were lower (P < 0.05) compared with sample 3 collected 2-3 hours before the new bedding was spread, but dry matter of straw in sample 1 was higher (P < 0.05) compared with sample 3. The values of the coefficient of thermal conductivity show that the bedding from recycled sludge slurry is a good insulant and absorbent. In addition, a determined increase of humidity at the end of the bedding interval does not cause dramatic changes of thermal performance.

The aim of the experiment was to determine the concentrations of harmful gases production in the dairy housing and to compare the difference of measured data in terms of frequency of manure removal. Measuring the concentration of ammonia, methane and carbon dioxide was carried out in summer in three-day cycles when produced excrements were removed every day at 19:00 o'clock, and in three-day cycles when removing of excreta was carried out twice a day, in the morning and evening at 5:00 and 19:00 o'clock. Microclimatic conditions during the experiment were at a comparable level, ambient temperature was maintained at about 29 °C and relative humidity was 64 %. By comparing the obtained values of production in terms of frequency of waste removal, it has been shown that for removing twice a day, the production of ammonia, carbon dioxide, methane was higher than under manure removal only once a day. Keywords: ammonia, dairy housing, manure removal Abstrakt Cieľom experimentu bolo zistiť produkciu koncentrácií škodlivých plynov v objekte pre ustajnenie dojníc a porovnať rozdiel nameraných údajov z hľadiska frekvencie odstraňovania hnoja. Meranie koncentrácie amoniaku, metánu a oxidu uhličitého prebiehalo v letnom období v trojdenných cykloch, kedy vyprodukované exkrementy boli odstraňované raz za deň o 19:00 hodine a v trojdenných cykloch, kedy odstraňovanie exkrementov bolo vykonávané dvakrát za deň, ráno o 5:00 a večer o 19:00 hodine. Mikroklimatické podmienky vzduchu počas trvania experimentu boli 1262Journal of Central European Agriculture, 2013, 14(4), p.1262-1269 DOI: 10.5513/JCEA01/14.4.1340 1279 Journal of Central European Agriculture, 2013, 14(4), p.1279-1286 DOI: 10.5513/JCEA01/14.4.1340 na zrovnateľnej úrovni, teplota prostredia sa udržovala na cca 29°C a relatívna vlhkosť vzduchu 64%. Porovnaním získaných hodnôt produkcie z hľadiska frekvencie odstraňovania exkrementov bolo preukázané, že pri počte odstraňovania 2x za deň bola produkcia amoniaku, oxidu uhličitého aj metánu vyššia, ako to bolo pri vyhŕňaní len raz denne.