The use of medicinal plant extracts for improving the quality of laying hens’ environment

The aim of this study is to test the effect of thyme, oregano and combinatition of both medicinal plants extracts. The research was made during the period starting April till June, 2015 in LUHS VA experimental laying hens’ house (volume 27,25 m3, area 14,9m2). 64 laying hens (specie: ISA Brown) were kept in poultry in time of the experiment. The effect of the microclimate and microbiological pollution of 3 medical plant extracts was observed in poultry: thyme (40% in ethanol), oregano (40% in ethanol) and combination of thyme and oregano extract (ratio 1:1). Each extract was tested in 3 replicates. Medical plant extracts have been sprayed for 24 hours. In the experiment, values of temperature, air velocity, humidity, ammonia and carbon dioxiode concentration, dust concentration have been measured. Sedimentation method was used to take samples to test microbiological pollution and vital spores of microscopic fungi. The extract of thyme has shown the highest effect for microbiological pollution – 90,02 proc. (p<0,05). Pollution of the microscopic fungi has been decreased by 92,01 proc. (p