ABSTRACT.- Sorghum-associated arthrogryposis and axonopathy is a rare congenital condition reported in ruminants and horses. Here, we describe the epidemiologic, clinical, and pathologic aspects of nine outbreaks of this condition in beef cattle in midwestern and southeastern Brazil (2014-2023). These regions are the most productive grain sorghum areas, where livestock producers use the straw extensively, producing a high regrowth during drought periods. All the affected pregnant cows had grazed sorghum stover for periods ranging from 25 days to 4 months.

ABSTRACT.- Changes in light conditions may affect invasiveness as they can constrain different stages of plant development during the invasion process. This is particularly true in grazed grasslands, as livestock selectively removes above-ground biomass, promoting light heterogeneity. We assessed how light intensity and quality affect the germination and growth of Eragrostis plana, one of the most invasive alien grasses of the Río de la Plata grasslands (southern Brazil, Uruguay, and eastern Argentina).

ABSTRACT.- Background: Ixodes fuscipes is a tick species found in the Southern Cone of America and the only member of the Ixodes ricinus complex present in Uruguay. Members of this complex are particularly recognized as vectors of diseases affecting human health, such as babesiosis, caused by parasites of the genus Babesia (Apicomplexa: Piroplasmida). However, even though potential hosts of I. fuscipes in Uruguay (rodents, birds, and artiodactyls) are known carriers of Babesia species, the potential role of I. fuscipes as a vector of piroplasmids has not been studied.

ABSTRACT.- Understanding herbivore interaction with forage resources is crucial for effective grazing management. This study investigates the impact of sward management strategies on the foraging behavior of sheep under continuous stocking. Italian ryegrass pastures were maintained at an average sward height of 15 cm, which has been reported to be optimal for animal performance. The objective was to assess whether sheep modify their grazing behavior in response to different interventions to maintain the target sward height.

ABSTRACT.- Toxoplasmosis, caused by the obligate intracellular parasite Toxoplasma gondii, is one of the most prevalent zoonotic parasitic infections worldwide. When acquired during pregnancy, T. gondii can be transmitted to the fetus, with clinical outcomes influenced by gestational age at time of infection and the parasite's genotype. Prenatal screening enables the detection of maternal seroconversion and offers a critical window for intervention. In Uruguay, despite mandatory serological screening during pregnancy, national data on T.

ABSTRACT.- Background: Differential treatment of daughters of the same sire within a herd is modelled as the herd-sire effect. Recent changes in management practices may have led to the extensive use of certain bulls in a limited number of herds. In that case, although the effect can be well accounted for in genetic evaluation models, some approximation methods for reliabilities do not consider it correctly, leading to an overestimation of some sires' approximated reliabilities.

ABSTRACT.- Protists are one of the most diverse major eukaryotes in the soil ecosystems and play essential functional roles in shaping the microbial community structure, soil nutrient cycling, and crop productivity. However, protist community composition in soils is poorly understood, notably in paddy field soils with alternating oxic and anoxic phases and when under rotation with other crops and pastures. Furthermore, current knowledge about South American soils' protist communities is limited.

ABSTRACT.- Group A rotavirus (RVA) infections are a leading cause of neonatal diarrhoea in foals. Neonatal mice could serve as a useful tool to study the pathogenesis of equine RVA (ERVA) as well as a preclinical model for assessment of vaccine efficacy. This study aimed to comparatively evaluate the clinical, virological and pathological features of ERVA G3P[12] and G14P[12] infection in neonatal mice and compare them with porcine OSU G5P[7] and bovine UK G6P[5] RVA reference strains.

ABSTRACT.- This study evaluates the potential of hard hexaploid wheat (Triticum aestivum L.) lines, developed through marker-assisted selection (MAS), as an alternative to durum wheat for pasta production. Using hard hexaploid lines (SD lines) with targeted traits, such as increased gluten strength, protein content, and yellow coloration, the objective was to assess their performance relative to traditional durum wheat.

ABSTRACT.- Effective planning and decision-making for rice (Oryza sativa L.) cultivation require precise yield predictions. Thus, new prediction strategies that incorporate climatic effects and management variables are essential to bridge the gap between actual and potential yields. This study aimed to evaluate the predictive accuracy of rice yield under real production conditions, considering weekly climatic information. The specific focus was on identifying which factors contribute to improved predictive performance and when they play a critical role in the production cycle.