Las patologías causadas por plantas tóxicas son más comunes en sistemas productivos basados en campo natural y representan daños importantes en la producción, ya que se mueren anualmente 70.000 bovinos, pérdida que se traduce en un monto aproximado de U$S 15.000.000. Habiendo diferentes patologías referidas a las intoxicaciones es imprescindible realizar un diagnóstico correcto para lo cual el reconocimiento de las especies es fundamental.

Abstract Beef production with Holstein male calves is becoming more intensive in Uruguay. Some of the new systems with confined animals could improve productivity but also could compromise animal welfare. The aim of this study was to compare animal welfare, stress evidence and productivity of castrated young males reared in three different productive systems. The traditional pastoral system (T3) was compared with, a confined fattening system (T1) and an alternative one with confinement and six hours diary access to pastures (T2).

ABSTRACT. Uruguay is characterized by having an Africanization gradient in its honey bee (Apis mellifera) populations from areas bordering Brazil to the most remote locations. Morphological differences have also been found among Varroa destructor populations from different regions. A possible explanation for these morphological changes in mites could be explained by morphological correlations in the host/parasite A. mellifera/V. destructor system. The objective of the present study was to identify A. mellifera ecotypes in Uruguay and their correlation with V.