Degradación en el rumen de la proteína de algunas semillas de leguminosa

La dependencia del exterior en el suministro de concentrados proteicos y en particular de harina de soja, ha motivado una respuesta de la Administración pro¬ moviendo la utilización de recursos propios como la harina de-girasol o las semi¬ llas de leguminosas. Sin embargo, en muchos casos se carece de la información suficiente para el empleo correcto de estos alimentos en las raciones del ga¬ nado. El valor proteico de un alimento para los rumiantes viene determinado por su contenido en protefna bruta y por la degradabilidad de ésta en el rumen, factores ambos que condicionan la disponibilidad de nitrógeno por los mircroorganismos del rumen y la cantidad de proteína que llega al duodeno sin degradar. La degradabilidad de la protefna puede ser estimada, bien determinando la cantidad y origen del nitrógeno que llega a omaso o a duodeno, o bien cuantificacando el nitrógeno que desaparece de bolsas da nylón, cuando son incubadas en el rumen de animales fistulizados, durante distintos periodos de tiempo, según la técnica descrita por Mehrez y Orskov (1977). En el presente trabajo, se ha determinado la tasa y el ritmo de degradación de la protefna de varias semillas de leguminosas, cuando fueron incubadas en el rumen de ovejas alimentadas con heno de alfalfa

LAGOVirtual: A Collaborative Environment for the Large Aperture GRB Observatory

We present the LAGOVirtual Project: an ongoing project to develop platform to collaborate in the Large Aperture GRB Observatory (LAGO). This continental-wide observatory is devised to detect high energy (around 100 GeV) component of Gamma Ray Bursts, by using the single particle technique in arrays of Water Cherenkov Detectors (WCD) at high mountain sites (Chacaltaya, Bolivia, 5300 m a.s.l., Pico Espejo, Venezuela, 4750 m a.s.l., Sierra Negra, Mexico, 4650 m a.s.l). This platform will allow LAGO collaboration to share data, and computer resources through its different sites. This environment has the possibility to generate synthetic data by simulating the showers through AIRES application and to store/preserve distributed data files collected by the WCD at the LAGO sites. The present article concerns the implementation of a prototype of LAGO-DR adapting DSpace, with a hierarchical structure (i.e. country, institution, followed by collections that contain the metadata and data files), for the captured/simulated data. This structure was generated by using the community, sub-community, collection, item model; available at the DSpace software. Each member institution-country of the project has the appropriate permissions on the system to publish information (descriptive metadata and associated data files). The platform can also associate multiple files to each item of data (data from the instruments, graphics, postprocessed-data, etc.).Comment: Second EELA-2 Conference Choroni, Venezuela, November 25th to 27th 200

The Large Aperture GRB Observatory

The Large Aperture GRB Observatory (LAGO) is aiming at the detection of the high energy (around 100 GeV) component of Gamma Ray Bursts, using the single particle technique in arrays of Water Cherenkov Detectors (WCD) in high mountain sites (Chacaltaya, Bolivia, 5300 m a.s.l., Pico Espejo, Venezuela, 4750 m a.s.l., Sierra Negra, Mexico, 4650 m a.s.l). WCD at high altitude offer a unique possibility of detecting low gamma fluxes in the 10 GeV - 1 TeV range. The status of the Observatory and data collected from 2007 to date will be presented.Comment: 4 pages, proceeding of 31st ICRC 200

Water Cherenkov Detectors response to a Gamma Ray Burst in the Large Aperture GRB Observatory

In order to characterise the behaviour of Water Cherenkov Detectors (WCD) under a sudden increase of 1 GeV - 1 TeV background photons from a Gamma Ray Burst (GRB), simulations were conducted and compared to data acquired by the WCD of the Large Aperture GRB Observatory (LAGO). The LAGO operates arrays of WCD at high altitude to detect GRBs using the single particle technique. The LAGO sensitivity to GRBs is derived from the reported simulations of the gamma initiated particle showers in the atmosphere and the WCD response to secondaries.Comment: 5 pages, proceeding of the 31st ICRC 200