Feed Additives for Layer Chicken Health and Production: A Review

The poultry industry continuously seeks to improve the health and productivity of layer chickens to meet rising demands for eggs. Feed additives, including probiotics, prebiotics, enzymes, organic acids, and herbal extracts, have gained attention for their potential to improve health and production without relying on antibiotics. This review evaluates recent research on feed additives, focusing on their effects on egg production, quality, and immunity in layer chickens. New studies indicate that probiotics, such as Lactobacillus strains, and prebiotics, like mannan oligosaccharides (MOS), can improve nutrient absorption, enhance immunity, and reduce pathogenic bacteria. Enzyme supplements, especially those targeting non-starch polysaccharides, have shown promise in increasing digestive efficiency and nutrient bioavailability, ultimately supporting greater egg production. Organic acids, such as citric and lactic acid, were found to lower gut pH, suppress harmful bacteria, and improve feed conversion ratio. Additionally, herbal extracts like turmeric and oregano exhibited antioxidant properties, contributing to improved egg quality and bird health. The review highlights the importance of selecting the right additive combinations for optimal effects. This comprehensive review suggests that feed additives offer sustainable and antibiotic-free options to improve layer chicken health and productivity, aligning with current consumer and regulatory demands.