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HYGIENIC AIR QUALITY IN POLUTRY HOUSES FOR CONSUMER EGG LAYING HENS
Marija Vučemilo
; Veterinarski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Bara Vinković
; Hrvatski veterinarski institut Zagreb, Hrvatska
Kristina Matković
; Veterinarski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Renata Brezak
; Hrvatski veterinarski institut Zagreb, Hrvatska
Sažetak
In conditions of intensive housing of laying hens, exposed to increased efforts to satisfy aimed production, arise in the air of the poultry house great amounts of harmful pollutants. These pollutants under certain conditions could affect poultry health and health of humans that work there. Harmful substances that arise are corpuscular and gas air pollutants, that we investigated in our research. Researches were carried in the winter period on a farm with capacity of 12 855 laying hens of Issa Brown hybride. Laying hens were kept in cages, 8-10 units per cage. Samples were taken 15 times, daily. The air was sampled by MERCK MAS-100 device, (MERCK KgaA, Darmstadt, Deutschland) on ready nutrient and Sabouraud agar (Biolife, Milan, Italy). Microorganisms that grew on these media (bacteria nad fungi) were after incubation counted and the most common genuses were reinoculated for the purpose of identification. Dust was sampled by SKC pump SKC pumpe
(SKC Ltd., Blandford Forum, UK) on filters (Whatman International Ltd., Maidstone, UK). Temperature (tz °C), relative humidity (rv %) and air velocity (w m/s) were determined by TESTO 400 device (Testo Inc., Deutschland). Concentration of ammonia and carbon dioxide were determined by Dräger – Multiwarn II device (Dräger, Darmstadt, Deutschland). Obtained values of measured parameters were proccessed by Microsoft Excel and Statistica 6 programs. A descriptive statistical analysis was done and the level of statistical significance set at 5 % -p<0.05 by student t test. Concentration of bacteria was between 7.90 x 103 and 1.23 x 104 cfu/m3, fungi between 6.80 x 103 and 1.01 x 104 cfu/m3 and dust between 1.60 and 2.80 mg/m3. Determined average values of ammonia were between 4.12 and 7.11 ppm. Dominant bacteria were from genuses Staphylococcus, Streptococcus and Bacillus, and fungi were from genuses Aspergilus, Penicillium and Fusarium.
Obtained results of microclimate parameters were mainly consistent with recommended norms, as well as concentracions of microorganisms and dust.
Ključne riječi
air hygiene; bacteria; fungi; dust
Hrčak ID:
26509
URI
Datum izdavanja:
30.4.2007.
Posjeta: 1.371 *