Abstract
Background: Water pollution has become a major threat to the environment and the living so an eco-friendly bio-filter was chosen for its merits over conventional techniques.
Aim: Investigating the purifying activities of the Tilapia bone powder against inorganics, heavy metals, and microbial water pollutants and its impacts on performance, biochemical and antioxidant levels, cortisol and immunoglobulin concentrations, and intestinal microbiota in challenged broiler chickens.
Methods: The in-vitro activity of Tilapia bone powder was evaluated against magnesium chloride and lead nitrate using tube minimal inhibitory concentration (MIC), as well as against E. coli O1527:H7, Salmonella Typhimurium, Mycoplasma gallisepticum, Aspergillus niger, Trichophyton mentagrophytes, and Candida albicans using a 96-micro-well MIC. A total of 250 one-day-old Hubbard chicks were divided into five groups on a deep litter system. Chicks were supplemented daily with Tilapia bone powder (1 g/L) for 4-6 h from the 3rd day. Challenges were served on the 7th, 14th, 21st, 28th, and 35th days for four broiler groups using magnesium chloride (100 mg/L), lead nitrate (350 mg/L), E. coli (2.4 × 1012 CFU/ml), S. Typhimurium (1.8 × 108 CFU/ml) respectively, and the 5th group was assigned as a control. A total of 2250 samples (90 Tilapia-pollutants mixes, 480 Tilapia-microbial mixes, 240 sera, 240 intestinal swabs, and 1200 tissue samples) were collected.
Results: Tilapia bones powder 1% reveals a 100% reduction in the lead after 1-h, total and calcium hardness after 0.5 h, as well as 100% killing efficacy against E. coli O1527:H7, S. Typhimurium, M. gallisepticum, A. niger, T. mentagrophytes, and C. albicans after 0.5, 1, 1, 1, 1, and 1-h respectively. Tilapia bones powder 1% treated water reveals highly significant (p < 0.01) increases in dissolved oxygen and declines in physicochemical and microbial parameters compared with tap water. Challenged treated broilers revealed highly significant (p < 0.01) increases in weight gains, performance index, body weights, carcasses and organs weights, immunoglobulin concentrations, and antioxidant levels, as well as highly significant (p < 0.01) improvements in feed conversions, feed and water intakes, biochemical profile, cortisol hormone, and intestinal microbiota.
Conclusion: Tilapia bone powder provided significant in-vitro adsorptive and antimicrobial actions, as well as supported the broiler chickens to mitigate the polluted water stress accompanied by enhanced performance, carcass quality, immunity, and intestinal microbiota.

Key words: Broiler chickens, Immunity, Performance, Pollution, Tilapia bone waste, Water purification.