Resumen: El objetivo de este trabajo fue determinar la abundancia mitocondrial hepática en dos genotipos Holstein en un sistema pastoril durante lactancia media-tardía. Para este trabajo se utilizaron vacas del genotipo Holstein neozelandés y del genotipo Holstein norteamericano, las mismas pastorearon una pastura mixta de Medicago sativa y Dactylis glomerata y suplementadas con concentrados y reservas forrajeras. Se tomaron biopsias de hígado y

RESUMEN:

The rice sector is facing the challenge to keep increasing rice yields while maintaining or improving input use efficiency. This research has shown that the recommended nitrogen fertilization rate based on soil analyses, determined the highest yield with no statistically significant differences with the fertilization 50% above it.

The maintenance of an adequate soil nutrient status is crucial for ensuring food security while avoiding nutrient imbalances, mining, or enrichment that may lead to environmental damage. In Uruguay, the traditional rice-pasture rotation, allowing for direct livestock grazing, has gradually shifted towards more intensive rotations over the last decade, primarily adopting a rice-soybean rotation.