Gracilariopsis persica

This study examined the effects of dietary Gracilariopsis persica (0, 1, 3, and 5%) on growth performance, carcass traits, blood biochemistry, intestinal morphology, and cecal microbiota of Japanese quails during a 42‑day feeding trial. A total of 480 birds were randomly assigned to four treatments with four replicates of 30 birds each. Performance data (BW, WG, FI, FCR) were recorded at the pen level, while carcass, blood, jejunal morphology, and cecal microbiota measurements were taken from representative birds at day 42.
Overall, 1–3% seaweed maintained growth performance similar to the control, whereas 5% reduced final body weight. A 1% inclusion improved villus width, and the 5% diet increased Lactobacillus counts in the cecum. These results indicate dose‑dependent responses, with 1–3% representing a practical inclusion range.

Data Availability:
Raw data for growth performance and carcass traits are available from the corresponding author. For intestinal morphology and microbiota, only processed results reported in the manuscript are available, as the original raw measurements are no longer accessible. All processed datasets and analytical outputs will be provided upon reasonable request.