Presentación: Ing. Agr. Daniel Bayce, Director Ejecutivo de INASE.: La Evaluación Nacional de Cultivares es realizada bajo la responsabilidad del Instituto Nacional de Semillas (INASE) con el objetivo de proveer información objetiva y confiable sobre el comportamiento de los cultivares de las distintas especies de importancia agrícola a nivel nacional. Es también un requisito para la inscripción de cultivares en el Registro Nacional de Cultivares.Al presente, esta información es generada a través de un Convenio con el Instituto Nacional de Investigación Agropecuaria (INIA).

Abstract: Daily rumination time (RT; min/d) is recognized as an important tool for assessing the health of dairy cows, which may depend on the disease, lactation stage and individual cows. Using a systematic review-meta-analysis, this study evaluated whether the variation in RT is effective for early detection of metritis and subclinical ketosis (SCK) in dairy cows in the pre and post-partum periods (from three weeks before to three weeks after calving). The research was carried out in four electronic databases - Scopus, Science Direct, Pubmed and Web of Science.

Abstract: Aims: The Rio de la Plata grasslands are one of the largest areas of temperate humid and sub-humid grasslands of the world. A substantial fraction of these natural grasslands are preserved in Uruguay, occupying more than 60% of the country. So far, Uruguayan grasslands have been indirectly classified using only geomorphological and edaphic criteria. An adequate description of vegetation heterogeneity is a prerequisite to study ecosystem function and to design management and conservation strategies for this region.

Abstract: The Century model was used to simulate soil carbon (C) and nitrogen (N) cycling, and crop production dynamics in an ongoing field experiment in Uruguay (started in 1963). The model was calibrated using observed data from three treatments (crop or crop?pasture rotations) and validated with a fourth treatment. The model correctly predicted the impact of different treatments on microbial biomass, N mineralization, soil respiration, and crop yields.

?Rotatinuous? stocking is a grazing management strategy based on animal behavioural responses to sward structure which is designed to maximize herbage intake per unit of grazing time. It is an alternative to traditional grazing management practices focusing on pasture use efficiency and maximizing herbage accumulation and harvesting. To investigate this approach, Italian ryegrass (Lolium multiflorum) pastures grazed by sheep were evaluated in 2014 and 2015 under two contrasting grazing management strategies.

Abstract:Background and aims: The concepts of critical nitrogen (N) concentration and nitrogen nutrition index (NNI) provide effective tools for assessing the N nutritional status of pastoral systems. However, no conclusive data exist concerning the effects of stubble height at harvest on the Ndilution curve [N concentration (N%) = a(biomass)?b] and mixed species cultivation on N nutritional status of forage plants with contrasting growth strategies.

Abstract: The relationships between ovulation rate and nutrition remain confused, probably because of uncontrolled variation in experimental conditions. To help resolve the problem, we analyzed data from 20 experiments conducted between 2002 and 2016, in Uruguay with grazing ewes. All experiments were carried out by a single laboratory under comparable conditions of experimental design and measured variables. The studies used a total of 3?720 ewes, of purebred Corriedale, Polwarth, or East Friesian x Polwarth genotypes.

Diferenciar las comunidades vegetales de nuestro campo natural brinda criterios para realizar manejos más precisos, donde situaciones distintas puedan ser manejadas en forma diferente. Su descripción y cartografía generan un nuevo escenario para la diferenciación y valorización de la producción ganadera, combinando los sistemas de trazabilidad del ganado con la cartografía de las comunidades para tipificar la carne según atributos tales como la preservación de hábitats, naturales, servicios ecosistémicos y biodiversidad.

Each of these disciplines has developed numerous process?based and empirical models for AWM. However, models that simulate all major hydrologic, water quality, and crop growth processes in agricultural systems are still lacking. As computers become more powerful, more researchers are choosing to integrate existing models to account for these major processes rather than building new cross?disciplinary models. Model integration carries the hope that, as in a real system, the sum of the model will be greater than the parts.