ABSTRACT.- Context: The greenness index of the ear-leaf in maize (Zea mays L.) has been used to assess crop nitrogen (N) status, but it may not accurately predict yield responses to late N fertilization. Objective: This study aimed to i) analyze differences in the greenness index and N sufficiency index (NSI) across maize canopy leaf positions and their relationship with soil N availability, N nutrition index (NNI), and grain yield, and ii) evaluate the accuracy of NSI determined in different leaf positions in predicting the grain yield response to N fertilization at silking.

ABSTRACT.- The purpose of this experiment was to evaluate the transference of passive immunity (TPI) and growth achieved by calves born to dams with low or high SCC at dry-off and fed with colostrum from cows with low or high SCC at dry-off. Forty multiparous (3.2 lactations; SD = 1.1), dry, and pregnant Holstein cows were used. © 2025 American Dairy Science Association

ABSTRACT.- Congenital neoplasms are rare and sporadic in cattle and can cause losses due to abortions and perinatal or neonatal deaths. The etiopathogenesis of congenital tumors in bovine fetuses and neonates is largely unknown, and their diagnosis is often challenging.

ABSTRACT.- Using biomass of forest origin to obtain solid, liquid, and gaseous fuels has demonstrated its potential both at an experimental level and in commercial situations. This framework evaluated Eucalyptus benthamii, E. dunnii, and E. grandis planted at densities of 2220, 3330, 4440, and 6660 trees per hectare 56 months after planting. The chemical composition and heating value of biomass fractions were evaluated. The LHV value (KJ/Kg) of the bark was 17,227, 16,813, and 16,167; the leaves 22,491, 23,031, and 21,358; the wood 18,725, 18,577, and 18,828 for E. benthamii, E.

ABSTRACT.- In a beef cattle breeding farm located in northern Uruguay, an Aberdeen Angus calf was born with complex anomalies. The offspring was sired by one of the bulls of the farm. The calf died shortly after birth, displaying multiple malformations at external examination, including agenesis of the lumbar, sacral and coccygeal vertebrae and spinal cord and arthrogryposis of both pelvic limbs, characteristic of perosomus elumbis (PE).

ABSTRACT.- BACKGROUND: Piezodorus guildinii (Westwood, Hemiptera: Pentatomidae) causes economic losses in soybean crops by diminishing productivity, impacting grain size, oil content, and germination power. RNA interference (RNAi), a conserved gene regulation process initiated by double-stranded RNA (dsRNA), may be used as a safe technique in integrated pest management strategies. Conjugating dsRNA with cationic polymers, which protect dsRNA from degradation has shown to enhance this response. This study aims to assess the impact of dsRNA administration on the viability of P.

RESUMEN.- En Uruguay, la resistencia a los antihelmínticos está ampliamente distribuida, estimulando a investigar medidas de control alternativas. El objetivo fue evaluar el efecto de un extracto de taninos condensados de Schinopsis balansae (Quebracho) o levadura de Saccharomyces cerevisiae CNCM I-1077 (LEVUCELL®SC) sobre los nematodos gastrointestinal (NGI) de corderos. .............................................. ABSTRACT.- In Uruguay, anthelmintic resistance in sheep is widely distributed, which has made research into alternative control measures necessary.

RESUMEN.- El género de garrapatas Ixodes es considerado el más antiguo y diverso, con aproximadamente 279 especies. Dentro de este género, destacan las especies del complejo Ixodes ricinus que se han implicado en la transmisión de importantes enfermedades en humanos como la borreliosis de Lyme, anaplasmosis granulocítica humana y babesiosis. La babesiosis es causada por protozoarios del género Babesia y se considera una enfermedad zoonótica emergente a nivel mundial. El objetivo de este estudio fue caracterizar molecularmente las especies de Babesia en garrapatas I.

RESUMEN.- En las diferentes etapas de la interacción patógeno-hospedador se activan genes de virulencia que le confieren al microorganismo la capacidad de adherirse, invadir tejidos, sobrevivir intracelularmente entre otras funciones. En este trabajo se exploran los mecanismos de virulencia de Salmonella presentes en el genoma de aislamientos de origen bovino con el objetivo de explicar las diferentes presentaciones clínicas de la salmonelosis.

ABSTRACT.- Agriculture is transitioning towards more sustainable ways of producing food, fiber, and biofuels, with practices aimed at conserving soil resources by prolonging soil occupation with cash or cover crops and balancing the proportion of cereals and winter legumes when increasing the number of crops in the rotation. Likewise, closing nutrient biogeochemical cycles is critical, particularly for N, which requires adjusting fertilizer rates to avoid surplus or soil mining.