Comparative Impact of Silver Nitrate and Eco-Friendly Silver Nanoparticles on Sexual Behavior, Productivity, and Bioaccumulation in the Reproductive Organs of Japanese Quails

Silver nanoparticles (Ag-NPs) are emerging as natural antimicrobial growth promoters in poultry, known for enhancing gut health, immunity, and productivity. This study assessed the effects of Ag-NPs and silver nitrate (AgNO₃) on sexual behavior, productivity, and silver bioaccumulation in the reproductive tissues of Japanese quails (<i>Coturnix japonica</i>). A total of 600 quails (8 weeks old) were randomly assigned to five groups (120 birds/group), each with six replicates (sex ratio 5 male: 15 females). Group 1 (control) received a basal diet, while Groups 2 and 3 were supplemented with Ag-NPs at 10 mg/kg and 20 mg/kg, respectively. Groups 4 and 5 received AgNO₃ at the same doses for eight weeks. Quails receiving 10 mg/kg Ag-NPs showed significantly improved male mating behavior, increased egg weight and mass, and enhanced egg quality, resulting in the highest fertility and hatchability performance. Silver accumulation in ovaries and testes increased dose-dependently, with the highest deposition observed in the 20 mg/kg Ag-NPs group. Correlation and regression analyses revealed weak and statistically non-significant relationships between ovarian silver levels and fertility and hatchability outcomes. These findings suggested that supplementation with 10 mg/kg Ag-NPs was a safe and effective feed additive for improving both productive and reproductive performance in Japanese quails.