The aim of this research was to estimate relations between temperature and humidity outside and inside of a permanently open sides barn for cows. This study was carried out in the period from Februa ry 1 st , 2009 to January 31 st , 2010 at a commercial dairy farm located in the South-Moravian region of the Czech Republic. During the study period temperature and humidity inside and outside the barn were systematically assessed. The research batch had 98 ± 3 cows. The barn had permanently open sides and during summer the main doors were mostly open. The cows in the research barn were of Czech Fleckvieh breed. The air temperature (°C) and humidity (%) were measured every fi een minutes during the whole study period using 4 data loggers (HOBO technology; RH/Temp/), out of which were three (L1, L2 and L3), located inside the barn (Figure 1) and one (L0) outside the barn. The values of temperature-humidity index (THI) were calculated using the equation proposed by HAHN (1999). Mean daily outside and inside temperatures corresponded with each other, with outside temperatures always being lower than inside temperatures. The diff erence between the inside and outside temperature was lowest in March (0.01 °C) and highest in October (3.48 °C). Mean values of humidity outside and inside also corresponded; however, they were sometimes higher outside and sometimes inside the barn. The smallest diff erence between the inside and outside humidity was recorded in August (0.18 %) and the greatest in March (13.21 %). Mean values of temperature-humidity index (THI) inside and outside the barn also corresponded, with outside values being in most cases lower than inside values. The diff erence between inside and outside THI values was lowest in December (0.07) and highest in October (5.96). The mutual relationships between the values recorded by individual loggers were very close (including the outside logger). Slightly weaker was the relationship between L2 and other, both outside and inside, loggers.

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.