Protocolo de indução de cetose sub-clínica em ovelhas prenhes e seu efeito sobre parâmetros metabólicos.

O objetivo deste estudo foi avaliar a eficiência de um protocolo de indução de cetose sub-clínica em ovelhas em terço final de gestação, através de seu efeito sobre parâmetros bioquímicos

Prepartum body condition score changes and the secretion of acute phase proteins in dairy cows.

O objetivo deste estudo foi investigar o efeito da condição corporal (BCS) durante o período de pré-parto, sobre a concentração de proteínas de fase aguda e parâmetros metabólicos em vacas leiteiras

Effect of butaphosphan and cyanocobalamin on postpartum metabolism and milk production in dairy cows.

O objetivo deste estudo foi determinar o efeito de butaphosphan e cianocobalamina (BTPC) no plasma e na produção de leite, em vacas leiteiras no pós-parto

The Rhyolitic Plateau of the Marifil Formation (Jurassic): A Gondwana Paleosurface in the Southeastern Portion of the Northern Patagonian Massif

Along the southeastern border of the Northern Patagonian Massif of the provinces of Río Negro and Chubut, an extensive surface is presently called the “Rhyolitic” or “Ignimbritic Plateau.” This large geomorphological unit has a geographical extension which exceeds 50,000 km2 and it is located between 40°30′ and 44° lat. S and between the Atlantic Ocean coast and 67°30′ long. W. It is characterized by a smooth topography of low and rounded hills, shallow endorheic basins, and a poorly integrated drainage network. The drainage network is mostly nonfunctional and roughly coincident with the bedrock fracture system. Bedrock is almost exclusively composed of the acid volcanic and pyroclastic rocks of the Marifil Formation of Early to Middle Jurassic age. A significant proportion of the identified positive landforms present form and nature very similar to that of “bornhardts,” as defined by Twidale (Revista de la Asociación Geológica Argentina 62(1):139–153, 2007), basically for granites. Bornhardts are uncovered dome hills (Twidale, Revista de la Asociación Geológica Argentina 62(1):139–153, 2007) which are usually frequent in Gondwana landscapes (Fairbridge, Encyclopedia of geomorphology. Ronald, New York, 1968). Furthermore, the ubiquitous presence of “corestones” (isolated, large, rounded boulders), which are taken as indicators of an ancient, deep weathering front, supports the hypothesis that these paleosurfaces were generated by long-term, intense chemical weathering processes. The deep weathering would have occurred over at least 25 Ma, between the Middle and Late Jurassic, under a hot and moist paleoenvironment and under extremely stable tectonic conditions. The mobilization, denudation, and later sedimentation of the regolith/saprolite formed under such conditions would have taken place during several erosion episodes, mostly under tectonic forcing, between the Late Jurassic and the Late Cretaceous. The important clay and other secondary mineral accumulations (some of them significant sources of uranium) in the region would have a direct genetic relationship with the development of these paleosurfaces. From the Late Miocene onwards, the colder and drier conditions that were imposed in the region by the uprising Andes and the establishment of mountain glaciers and ice caps during numerous glaciations allowed the modification of this landscape by hydro-eolian processes which generated the widely distributed endorheic depressions (locally known as “bajos sin salida”) by deflation and occasionally reworked the surviving rocky hills by abrasion.Fil: Martinez, Oscar A.. Universidad Nacional de la Patagonia "San Juan Bosco"; ArgentinaFil: Rabassa, Jorge Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentin