Bacillus licheniformis baktériumot és zeolitot tartalmazó alomkezelő készítmény hatásának vizsgálata bak hízópulyka-állományban

Abstract

Background: The beneficial effects of Bacillus licheniformis spore-forming bacterium, highly resistant to environmental influences, on gut flora and its potential for beneficial properties in organic matter treatment have been published previously. This bacterium may contribute to the reduction of pollutant gas concentrations through protein degradation, decomposition of animal carcasses and feathers, and reduction of ammonia emissions, thus leading to performance growth through improved animal welfare aspects. Objectives: The aim of the study was whether and to what extent the bacterium Bacillus licheniformis in zeolite carrier medium improves indoor air quality by inhibiting ammonia formation. The authors also wanted to know whether the product had a positive effect on performance indicators (feed conversion, live weight). Materials and Methods: The effect of Bacillus licheniformis at a concentration of 5.2x108 CFU/g in zeolite carrier medium (AlomPur®, Biovéd 2005 Ltd., Pinkamindszent, Hungary) was investigated in commercial turkey flocks at normal (2.5 birds/m2) and increased (3.5 birds/m2) stocking densities for 18 weeks fattening period. Birds were placed to the experimental farm at 6 weeks of age and weight gain was measured weekly until 24 weeks of age. Air quality was assessed by recording ammonia and carbon dioxide concentrations. In addition, feed conversion ratio (FCR) was calculated at 20, 22 and 24 weeks of age. Results and Discussion: After evaluating the experimental results, it was found that the litter treatment significantly improved air quality by reducing ammonia concentrations as the rearing period progressed in the treated groups compared to controls at both normal and higher stocking densities. There were also significant differences in average weights between groups from week 15 to week 24. Feed conversion ratios at the ideal slaughter age of 20–21 weeks of age were slightly better in the litter treated groups compared to the control groups. However, the positive effect on feed conversion ratio could no longer be observed at age of 23–24 weeks.