ABSTRACT.- Feed intake is a challenging trait to measure due to the high costs associated with labor, feeding, and facilities. Applying machine learning approaches, considering traits as potential predictors, offers a cost-effective alternative to direct feed intake measurement. By leveraging existing animal data, these models can optimize resources and enable feed intake estimation across a larger population without the need for labor-intensive trials. This research aimed to test combinations of

ABSTRACT.- This study evaluated the effects on production and reproduction after twelve years of genetic selection aimed at reducing fiber diameter while simultaneously increasing fleece weight and live weight in Merino sheep from the CRILU Genetic Nucleus (Uruguay). Phenotypic data from lambs (n = 4,809) and ewes (n = 1,741; 5,228 records), born between 2009 and 2021, were compared across three periods: 2010-2013, 2014-2018, and 2019-2022.

ABSTRACT.- In citrus growing areas where Citrus tristeza virus (CTV) is endemic, Poncirustrifoliata is commonly used as a rootstock to prevent tree decline. However, resistance breaking (RB) CTV isolates, capable of systemically infecting P. trifoliata,have been identified. Never-theless, their effects on the rootstock remain understudied. Therefore, the aim of this work was to evaluate the physiological response of P. trifoliatato infection by a local RB isolate (RB-UY1), and determine its effects on grafted scions, using Navel orange (N/P. trifoliata) and Mexican lime (ML/P.

ABSTRACT.- Background: In horses, the mechanisms behind ovarian follicle growth and oocyte maturation remain largely unknown. In other species, oocyte-secreted factors growth differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15) have been related to the acquisition of developmental competence and to interaction with granulosa cells for the regulation of follicle development. This study assessed the expression and localization of GDF9 in the equine ovary, and its possible relationship with granulosa cell function. -- © The Author(s) 2025. Open Access

ABSTRACT.- This study aimed to estimate variance components (VCs) for growth and reproductive traits in Nellore cattle using two relationship matrices (pedigree relationship A matrix and pedigree plus genomic relationship H matrix), and records collected before and after genomic selection (GS) implementation. The study also evaluated how genomic breeding values (GEBV) are affected by variance components and discarding old records. The analysed traits were weight at 120 days (W120), weight and scrotal circumference at 450 days (W450 and SC450, respectively).

ABSTRACT.- Honey bees (Apis mellifera L.) construct a structured nest with separated areas for the brood, pollen and honey that optimizes the functioning of the colony. However, in the Eucalyptus grandis plantations, bees tend to store a great amount of pollen and nectar in the brood area during the flowering period, reducing the space for the queen's egg laying. Through the python informatic program "CombCount" and an image program, the capped brood area and the proportion of cells occupied by brood, pollen or nectar during the flowering period of E.

ABSTRACT.- The global rise in afforestation highlights the need for improved forestry practices, underscoring the demand for enhanced management strategies and research. Integrated intercropping systems offer sustainable solutions, promoting biodiversity and ecosystem health. This research explored the long-term effects of weed control and row spacing on eucalyptus (Eucalyptus grandis) and pinus (Pinus taeda), intercropped with switchgrass (Panicum virgatum), within a Uruguayan setting.

ABSTRACT.- We reviewed the history, epidemiology, clinical signs, pathology, pathogenesis, treatment, control, and prophylaxis of Sorghum poisoning in livestock. Economic losses in the livestock industry associated with sorghum have been reported since the 19th century. Hyperacute/acute poisoning associated with cyanide (HCN) or nitrate/nitrite frequently occurs in ruminants that consume high quantities of growth and regrowth sorghum after drought, followed by rainfall, respectively.

ABSTRACT.- Erigeron species form a complex of weed species that have evolved herbicide resistance in Uruguay. Genetic studies using seeds from different biotypes are frequently conducted to understand how this evolution occurred. However, these seeds are extremely small, and there is limited information available on their long-term conservation in germplasm banks.