ORIGINAL_ARTICLE od air quality in poultry houses is crucial for animal health and productivity. In these houses, air is generally contaminated with noxious gases and microorganisms, the concentrations of which depend on numerous factors including microclimate. In this case study, the relation between microclimate and air concentrations of noxious gases and microorganisms was investigated in extensively reared turkey house. The study was carried out at a family household in Dalmatia hinterland, Croatia, with 50.3±3.1 turkeys kept in the house during the study period. Air temperature, relative humidity, airflow rate, concentrations of ammonia, carbon dioxide, bacteria and fungi in indoor air were measured three times per month from September to December, in the morning, prior to releasing turkeys out for grazing. Air temperature ranged from 9.73 to 26.98 °C, relative humidity from 63.29% to 75.08%, and airflow rate from 0.11 to 0.17 m/s. Lowest ammonia and carbon dioxide concentrations were measured in September (2.17 ppm and 550 ppm, respectively) and highest in December (4.50 ppm and 900 ppm, respectively). Bacterial and fungal counts were lowest in December (2.51x105 CFU/m3 and 3.27x103 CFU/m3 air, respectively) and highest in September (6.85x105 CFU/m3 and 1.06x105 CFU/m3 air, respectively). Air temperature and relative humidity showed negative correlation with concentrations of noxious gases and positive correlation with air microorganisms (P < 0.05 all). https://macvetrev.mk/Files/Article/2019/10.1515/macvetrev-2017-0015/macvetrev-2017-0015.pdf 2017-03-15T09:00:00 83 90 10.2478/macvetrev-2017-0015 turkeys ammonia carbon dioxide bacteria fungi Mario Ostović mostovic@vef.hr false 1 Department of Animal Hygiene, Behaviour and Welfare, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia LEAD_AUTHOR Sven Menčik false 2 Department of Animal Husbandry, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia AUTHOR Ivica Ravić false 3 Veterinary Department, Mostar, Bosnia and Herzegovina AUTHOR Slavko Žužul false 4 Department of Animal Hygiene, Behaviour and Welfare, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia AUTHOR Željko Pavičić false 5 Department of Animal Hygiene, Behaviour and Welfare, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia AUTHOR Kristina Matković false 6 Department of Animal Hygiene, Behaviour and Welfare, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia AUTHOR Boris Antunović false 7 Department of Animal Husbandry, Faculty of Agriculture, Josip Juraj Strossmayer University, Osijek, Croatia AUTHOR Danijela Horvatek Tomić false 8 Department of Poultry Diseases with Clinic, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia AUTHOR Anamaria Ekert Kabalin false 9 Department of Animal Husbandry, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia AUTHOR Ekert Kabalin A, Menčik S, Ostović M, Štoković I, Grgas A, Horvath Š, Balenović T, Sušić V, Karadjole I, Pavičić Ž, Morphological characteristics of Dalmatian turkey: preliminary resultsMaced J Anim Sci 2012; 2: 277-280. 1 Maurić M, Starčević K, Menčik S, Ostović M, Ekert Kabalin A, Influence of meat type, sex and storage time on fatty acid profile of free range Dalmatian turkeyMac Vet Rev 2016; 39: 167-174. 2 10.1515/macvetrev-2016-0081 Ekert Kabalin A, Menčik S, Ostović M, Kabalin H, Balenović M, Balenović T, Štoković I, Sušić V, Starčević K, Maurić M, Tissue share in the breast, thighs and drumsticks of turkeys from Dalmatian hinterlandStočarstvo 2013; 67: 9-16.in Croatian 3 Cargill C, Murphy T, Banhazi T, Hygiene and air quality in intensive housing facilities in AustraliaAnim Prod Aust 2002; 24: 387-393. 4 Dalólio FS, da Silva JN, Albino LFT, Moreira J, Mendes LB, Air pollution and their mitigation measures in Brazilian poultry productionAfr J Agric Res 2015; 10: 4522-4531. 5 10.5897/AJAR2015.10356 Ritz CW, Fairchild BD, Lacy MP, Implications of ammonia production and emissions from commercial poultry facilities: A reviewJ Appl Poult Res 2004; 13: 684-692. 6 10.1093/japr/13.4.684 Olanrewaju HA, Dozier WA, Purswell JL, Branton SL, Miles DM, Lott BD, Pescatore AJ, Thaxton JP, Growth performance and physiological variables for broiler chickens subjected to short-term elevated carbon dioxide concentrationsInt J Poult Sci 2008; 7: 738-742. 7 10.3923/ijps.2008.738.742 Ni J.-Q, Heber AJ, Hanni SM, Lim TT, Diehl CA, Characteristics of ammonia and carbon dioxide releases from layer hen manureBr Poult Sci 2010; 51: 326-334. 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