ABSTRACT.- Intoxication of sheep and cattle by Astylus atromaculatus recently occurred in Uruguay and Argentina in association with severe drought. Although the disease was experimentally reproduced in sheep in the 1970s, there is limited information on clinical and pathologic findings of sheep experimentally intoxicated by this beetle. Here, we described the clinical, gross, and microscopic findings in 3 sheep orally dosed with A. atromaculatus (treatment group, TG) and in 2 control sheep (control group, CG) dosed with distilled water.

ABSTRACT.- Cow-calf systems grazing native grasslands must transition toward improved economic performance simultaneously with the conservation and improvement of ecosystem services they provide. We present an innovation model with this objective based on a hierarchical model that links functional relationships between state variables, grazing experiments and its validation, and co-innovation at the farm level.

ABSTRACT.- Questions: Degradation of facilitative interactions of native species can play an important role in the establishment and expansion of invasive plants in communities. We evaluated the relationship between the level of invasion of Cynodon dactylon and the arbuscular mycorrhizal colonization of the native Paspalum notatum in Uruguayan grasslands, which were either extensively managed (natural vegetation [NG]) or oversown with exotic legumes and fertilized with phosphorus (NG + LP).

ABSTRACT.- Latin America (LA) is one of the main providers of meat and fibres of the world, comprising 30% and 6% of cattle and sheep stock in the world. The region has the largest reserve of land with agricultural potential determined by 16% of the world's agricultural land and 33% of its unused agricultural area. LA countries play a key role for food security not only in the region, but also for the rest of the world (OECD et al., 2023).

ABSTRACT.- Reduction of greenhouse gas (GHG) emissions, and particularly enteric methane (EM) emissions, from ruminant livestock is a global problem faced by all producers. Although large ruminants make up the majority of the enteric methane emissions from livestock, in 2015 there were 1.18 billion sheep in the world emitting 158 Mt of carbon dioxide (CO2) equivalents of EM, or 6% of the total EM emissions (FAO 2022).

ABSTRACT.- Infection by gastrointestinal nematodes (GINs) in sheep is a significant health issue that affects animal welfare and leads to economic losses in the production sector. Genetic selection for parasite resistance has shown promise in improving animal health and productivity. This study aimed to determine if incorporating genomic data into genetic prediction models currently used in Uruguay could improve the accuracy of breeding value estimations for GIN resistance in the Australian Merino breed.

CONTENIDO. -- Síntesis de la situación agroclimática de enero-- Perspectivas climáticas trimestrales elaboradas por el IRI de la Universidad de Columbia (Más información puede encontrarse en el sitio del IRI: http://www.iri.columbia.edu) -- Índice de vegetación (NDVI) -- Precipitaciones -- Porcentaje de agua disponible (PAD) -- Agua no retenida (ANR) -- Índice de bienestar hídrico (IBH) -- Perspectivas climáticas feb-mar-abr elaboradas por el IRI de la Universidad de Columbia. -- Destacamos para este mes: INIA Termoestrés.

ABSTRACT.- Wheat (Triticum aestivum L.) is a key global crop essential for food security. Enhancing wheat productivity is crucial to meet growing food demands. Quantitative trait loci (QTL) such as QFFE.perg-5A and QFEm.perg-3A have been previously linked to fruiting efficiency at the spike level, but their effects on plot-level yield components remain unexplored. 4290/© 2024 Elsevier B.V. All rights are reserved.

ABSTRACT.- Societal Impact Statement: Arbuscular mycorrhizal (AM) fungi support plant development by enhancing growth and resistance to pathogens through mycorrhiza-induced resistance (MIR). However, the varying capacities of individual AM fungal species to induce MIR are not well-understood, limiting their agricultural potential. This study reveals that specific AM fungal isolates differ in their ability to enhance tomato growth and reduce biomass losses due to Rhizoctonia solani infection, a major root pathogen.

ABSTRACT.- Introduction: Improving the feed efficiency (FE) in ruminants offers significant potential for optimizing the use of natural feed resource while simultaneously