This study tested whether combining organic selenium and a prebiotic from yeast could improve broiler chicken health without using antibiotics. The researchers fed different groups of chickens either selenium alone, the prebiotic alone, or combinations of both at different levels over 35 days. They found that the combination of higher selenium levels with the prebiotic worked best for improving meat quality, immune system strength and gut health, making it a promising natural alternative to growth-promoting antibiotics in chicken farming.