High stocking densities, closed animal houses, and elevated concentrations of bacteria, fungi, and the products of their activity, including ammonia and hydrogen sulphide, have adverse health effects. Active techniques used to reduce unfavourable environmental conditions, such as ventilation, sprinkling, bedding sorbents, and nutritional treatments, are not always sufficient to improve the animals’ living environment. The current paper aims to evaluate the effect of radiant catalytic ionization (RCI) on airborne microorganisms, cage microbiological status, gaseous ammonia concentrations, and the haematological status of mice in animal houses. After one week of operation of an RCI system, the number of airborne bacteria and fungi in the experimental room decreased in comparison to the first day of the experiment (p < 0.05 and p < 0.05 respectively), as did the concentrations of ammonia (p < 0.01) and dust. At the same time, the basic health parameters of the mice, determined in the blood, were very similar between the control and experimental room. RCI seems to be an ideal solution to ensure high hygiene standards in animal rooms and houses with limited use of disinfectants or antibiotic treatment of sick animals. An additional, environmental benefit is the limited amount of nitrogen released.

This study evaluates the effects of Advanced ActivePure technology, a photocatalytic air purification system, on the health status of mice housed in a controlled environment. This novel technology is promising due to its ability to eliminate the risk of ozone release into the environment, making it safer compared to other photocatalytic oxidation technologies. Utilizing 300 6‐month‐old mice over a period of 3 months, this research investigated various health parameters, including haematological, serum biochemical, redox, and inflammatory indicators. The experiment demonstrated no significant alteration in the majority of tested parameters between the control and Advanced ActivePure‐exposed groups. Until now, no study has analyzed the health safety of living organisms exposed to Advanced ActivePure in such a detailed manner. Histopathological analyses of nasal and eye tissues showed no adverse changes attributable to Advanced ActivePure exposure. These findings suggest that Advanced ActivePure technology does not negatively impact the overall health of mice, including biochemical markers and respiratory histopathology.

Ross 308 chickens were randomly divided into 2 groups of 600 birds each: a control group (C) and an experimental group (M). The birds were reared for 42 days in accordance with the flock management guidelines. Group M was exposed to music for 2 h/day and for 30 min before slaughter (~70 dB). After slaughter, the carcasses were cooled, and after 24 h, the pectoral muscles were collected for further physicochemical analyses. The study results revealed a lower value of drip loss in the pectoral muscles of the chickens from group M than in those from group C (p ≤ 0.01). Moreover, the muscles from group M chickens had higher pH values at 15 min, 1 h, and 12 h (p ≤ 0.01) and also at 4 h (p ≤ 0.05) post-mortem. Pectoral muscles of group M chickens also showed lower L* and b* color parameters (p ≤ 0.01), collagen content (p ≤ 0.05), and GSH concentration (p ≤ 0.01), compared to control birds. Exposure to ambient relaxation music in the scheme used in the study may be an effective form of environmental enrichment for broiler chickens, leading to physicochemical changes in their pectoral muscles consistent with potentially lower pre-slaughter stress.