Summary
Changes in ruminal microbial community can affect animal productivity, nutrient utilization efficiency, and environmental impact. This study aimed to evaluate the effect of two levels of supplementation plus a blend of phytogenic additives (essential oils, saponins, and spices) on the ruminal bacterial community in beef cattle grazing tropical pastures. The experiment was conducted at the Beef Cattle Sector of UNESP, Jaboticabal-BR, and lasted 84 days. Nine castrated Nellore steers (body weight of 262 ± 31.2 kg) cannulated in the rumen were assigned to 3 simultaneous 3 × 3 Latin square designs. Animals were kept on pasture of Urochloa brizantha cv. Marandu during the rainy season. The treatments included ad libitum mineral supplementation (MS) as the control group, added mineral suppleme
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