ABSTRACT. Disease caused by gastrointestinal nematodes (GIN) is one of the main constraints for sheep production worldwide. Although adult categories are more resistant to GIN, a temporary loss of acquired immunity is presented around parturition, which results in the so-called ?periparturient rise? (PPR) in fecal excretion of GIN eggs. The objective of the present work was to study the dynamic of the PPR and to model the faecal worm egg count (FEC) curve during the periparturient period in Uruguayan Merino sheep.

RESUMEN. El rendimiento potencial del cultivo de tomate para industria en el Uruguay según experimentos en el país es de 90 Mg ha-1. En contraposición, la productividad promedio del cultivo a nivel comercial no supera los 50 Mg ha-1. Este trabajo tiene por objetivo determinar cuales son las causas principales que determinan las diferencias de rendimiento entre productores de tomate para industria, estableciendo un orden jerárquico de factores determinantes. Para esto, se realizó un análisis de los factores que afectaron el rendimiento en los sistemas de producción en la zafra 2007/08.

The aim of the present study was to estimate the (co)variance components for the most economically important wool traits in Merino sheep in Uruguay, testing the importance of maternal effects and determining the most appropriate model for each trait. The characters analyzed were greasy fleece weight (GFW), clean fleece weight (CFW), average fibre diameter (FD), coefficient of variation of fibre diameter (CVFD), staple length (SL) and Comfort Factor (CF) (percentage of fibres lower than 30µm) at yearling shearing (12.5 months of age).

RESUMEN. - Se presenta una revisión sobre enfermedades hereditarias letales descritas en nuestro país con énfasis en aquellas que han sido confirmadas por diagnóstico anatomopatológico y molecular. Las enfermedades congénitas y/o hereditarias observadas por el DILAVE para la región Este de nuestro país, se estiman entre un 3% a 9% de morbilidad en el período de 2009 a 2011. Se discute la pertinencia y relevancia de realizar su control considerando la actual legislación uruguaya con el fin de detectar animales portadores sanos y disminuir las pérdidas por mortandad.

ABSTRACT. Grapevine phylloxera, Daktulosphaira vitifoliae (Fitch) (Hemiptera:Phylloxeridae) is a worldwide pest of Vitis species. It has forms that feed on leaves and roots. Root forms predominate on Vitis vinifera (L.) cultivars, while leaf forms predominate on Vitis species from its native American range. Recently, high densities of D. vitifoliae infestations in leaves of V. vinifera in Brazil, Peru, and Uruguay have been reported. The aims of this study were to determine the seasonal development of grape phylloxera, quantify infestation levels on V.

ABSTRACT. Cryptoblabes gnidiella (Millière) (Lepidoptera: Pyralidae) has been known in Uruguay for 30 years and only in vineyards, despite being polyphagous. In recent years, this pest has caused sporadic but serious damage on some grapevine cultivars. Understanding the insect's phenology and developing a monitoring program are essential aspects of integrated pest management.

ABSTRACT. Cryptoblabes gnidiella (Millière) (Lepidoptera:Pyralidae) has been known in Uruguay for 30 years and only in vineyards, despite being polyphagous. In recent years, this pest has caused sporadic but serious damage on some grapevine cultivars. Understanding the insect's phenology and developing a monitoring program are essential aspects of integrated pest management.

ABSTRACT. A vineyard in south-central Chile was surveyed during five growing seasons to analyze the increase over time in the number of plants infected with Grapevine leafroll-associated virus-1, -2 and -3. At the end of the study, GLRaV-3 was found to be the most prevalent virus, with 46% of plants infected by this pathogen. GLRaV-2 infected 13% of plants, and GLRaV-1 infected 12%. Considering all three viruses together, the prevalence of infection increased exponentially from 14% of the plants at the beginning of the study period to 68% at the end.

ABSTRACT. The purpose of this study was to determine if the set of genomic regions inferred as accounting for the majority of genetic variation in quantitative traits remain stable over multiple generations of selection. The data set contained phenotypes for five generations of broiler chicken for body weight, breast meat, and leg score. The population consisted of 294,632 animals over five generations and also included genotypes of 41,036 single nucleotide polymorphism (SNP) for 4,866 animals, after quality control.