Indoor climatic status during winter conditions in dairy herds in Bosnia and Herzegovina

Abstract

Indoor climatic status during winter conditions in dairy herds in Bosnia and HerzegovinaThe aim of this cross-sectional field study was to describe climatic status in dairy barns during winter conditions both in lowland and in mountainous regions of Bosnia and Herzegovina. While all the mountain herds had tie-stall systems (MT), eight of the lowland herds had group housing systems (LG) and the remaining 30 herds had tie-stall systems (LT). The mean indoor air temperature (T i ) was around 10 °C across types of barns and in all herds T i was above 0 °C. The mean relative air humidity (RH) was actually highest in the LT-group, but within the recommended level for both LG, LT and MT barns. At the 15 % of the MT barns, 17 % of the LT barns and 38 % of the LG barns the air velocity was > 0.2 m/s. The level of NH 3 was quite low in all groups of barns, although somewhat higher in LT-barns. In none of the barns the level of NH 3 exceeded 3 ppm. Only in one barn (a MT-barn) the level of CO 2 exceeded 3000 ppm. We conclude that the climatic status in most dairy barns in Bosnia and Herzegovina during winter seem to be acceptable.Key words: cattle; dairy cows; housing; climatic status; air velocity; carbon dioxide; ammonia; winter; Bosnia and Herzegovina Zimske klimatske razmere v objektih za krave molznice v Bosni in HercegoviniNamen te presečne študije je bil opisati klimatske razmere v objektih za krave molznice v zimskem času v nižinskih in hribovskih območjih Bosne in Hercegovine. V vseh čredah v hribovskih območjih smo našli vezano rejo (MT), medtem ko so imeli v osmih čredah v nižinskem predelu skupinsko uhlevitev (LG), v preostalih 30 čredah pa vezano rejo (LT). Povprečna temperature zraka v objektih (T i ) je bila okrog 10 °C in v vseh čredah so bile temperature T i nad 0 °C. Povprečna relativna vlaga (RH) je bila najvišja v skupini LT, vendar še znotraj priporočenih vrednosti, tako v LG in LT, kot tudi v MT hlevih. V 15 % MT hlevov, 17 % LT hlevov in 38 % LG hlevov je hitrost zraka presegala 0,2 m/s. Koncentracija NH 3 je bila v vseh hlevih relativno nizka, le v LT hlevih je bila nekoliko višja. V nobenem od hlevov koncentracija NH 3 ni presegla 3 ppm. Samo v enem MT hlevu je koncentracija CO 2 presegla 3000 ppm. Na osnovi teh podatkov sklepamo, da so klimatske razmere v večini hlevov za molzne krave v Bosni in Hercegovini v zimskem času ustrezne.