Autoria: ANDRADE, W. R.; BERTOLONI, A. V.; PERNA JUNIOR, F.; FURTADO, A. J.; LELIS, A. L. J.; TRETTEL, M.; BERNDT, A.; OLIVEIRA, P. P. A.; PEREIRA, A. S. C.; RODRIGUES, P. H. M.

Resumo: Abstract: For cattle raised on tropical grass pastures, it is essential to explore strategies that circumvent climatic seasonality that affect forage availability and quality. We hypothesize that the intensification of grazing systems, with rotational and deferred methods, combined with ammonium nitrate or urea supplementation, are excellent strategies to increase ruminal efficiency and animal productivity. For this purpose, 8 cattle with cannulas were distributed in rotational and deferred grazing systems, supplemented with urea or ammonium nitrate, and evaluated throughout the four seasons of the year over a period of two years. Dry matter intake and digestibility were measured using indigestible neutral detergent fiber, titanium dioxide and chromium oxide markers. Ruminal kinetics and degradability of DM and nutrients were measured using the nylon bag technique. Urine parameters were used to estimate microbial nitrogen compounds synthesis and efficiency of microbial protein synthesis. The rotational grazing improves NPN intake, NDF and ADF digestibility, and gross energy. Ammonium nitrate supplementation showed improved efficiency in microbial protein synthesis without negatively affecting feed intake, positioning it as a valuable nitrogen source for grazing cattle.

Ano de publicação: 2025

Tipo de publicação: Artigo de periódico

Unidade: Embrapa Pecuária Sudeste

Palavras-chave: Beef cattle, Gado de Corte, Grazing, Nitrato de Amônio, Nonprotein nitrogen, Rotational grazing, Sistema de Pastejo, Suplemento Alimentar