En este artículo presentamos una línea de investigación financiada por INIA en conjunto con PROCISUR y FONTAGRO, que ha trabajado sobre las emisiones de CH4 entérico y la dinámica del N en el sistema planta-animal, con el objetivo de cuantificar el potencial mitigador de las emisiones GEI en la ganadería extensiva a partir de la inclusión de leguminosas con taninos en un campo natural.

La discusión sobre políticas globales para reducir las emisiones GEI se basa en métricas actualmente cuestionadas por la ciencia. Los sistemas ganaderos a pasto son discriminados injustamente por indicadores como el llamado Potencial de Calentamiento Global (GWP), que sobreestima el supuesto efecto de gases de vida corta como el metano. Nuevas métricas, como el GWP*, reconocen que una tasa constante de emisión de CH4 no contribuye sustancialmente al calentamiento global.

ABSTRACT.- Ninety lambs reared on pastures were slaughtered for 2 y corresponding to 3 ages of slaughter:At weaning with 4 mo of age (4M), at 6-7 mo of age (6M), and at 12 mo of age (12M; last treatments were weaned at 4 mo). With the purpose of deseasonalizing high-quality meat lamb production in the year, the present work aimed to achieve hot carcass weight (HCW) of 18?20 kg on average in each lamb group. Hot carcass weight, carcass yield (CYd), subcutaneous tissue depth, leg, frenched rack, and loin weights were determined.

ABSTRACT.- Bee stings (BS) are a life-threatening issue and a growing concern for public health and animals in the Americas. We describe the clinical, pathological, and ultrastructural findings of a massive lethal bee attack in two non-human primates (NHPs). Both animals showed BS scattered throughout the skin, surrounded by a local reaction, diffuse pulmonary congestion, edema, hemorrhage, and remarkable degeneration and necrosis of renal epithelial cells from the proximal and distal tubules, characterizing a systemic bee envenomation reaction. © 2024 Elsevier Ltd

ABSTRACT.- In the summer of 2023, ingestion of Astylus atromaculatus (pollen beetle) was linked to spontaneous fatal disease in grazing cattle and sheep in Argentina and Uruguay. While the disease was experimentally reproduced in sheep and guinea pigs in the 1970's, no experimental reproductions have been attempted in cattle, and controversy exists as to whether this insect is indeed noxious to cattle and at which dose. Here, we demonstrate that A. atromaculatus causes acute fatal disease in Hereford calves at single oral dosages of 2.5, 4.5, 10.0, and 15.0 g of insect/kg body weight.

ABSTRACT.- Residual feed intake (RFI) has become in a widely spread index of feed efficiency. Although most of beef cattle systems in the world are pasture-based, RFI evaluation and research is usually performed in confinement conditions. In this context, residual heat production (RHP) estimated as the difference between actual and expected heat production (HP), could allow to identify efficient animals.