Valoración reproductiva de toros jóvenes de testaje de raza Parda de montaña

raza Parda de montañaPublishe

Gaia Early Data Release 3: Gaia photometric science alerts

Context. Since July 2014, the Gaia mission has been engaged in a high-spatial-resolution, time-resolved, precise, accurate astrometric, and photometric survey of the entire sky. Aims. We present the Gaia Science Alerts project, which has been in operation since 1 June 2016. We describe the system which has been developed to enable the discovery and publication of transient photometric events as seen by Gaia. Methods. We outline the data handling, timings, and performances, and we describe the transient detection algorithms and filtering procedures needed to manage the high false alarm rate. We identify two classes of events: (1) sources which are new to Gaia and (2) Gaia sources which have undergone a significant brightening or fading. Validation of the Gaia transit astrometry and photometry was performed, followed by testing of the source environment to minimise contamination from Solar System objects, bright stars, and fainter near-neighbours. Results. We show that the Gaia Science Alerts project suffers from very low contamination, that is there are very few false-positives. We find that the external completeness for supernovae, CE = 0.46, is dominated by the Gaia scanning law and the requirement of detections from both fields-of-view. Where we have two or more scans the internal completeness is CI = 0.79 at 3 arcsec or larger from the centres of galaxies, but it drops closer in, especially within 1 arcsec. Conclusions. The per-Transit photometry for Gaia transients is precise to 1% at G = 13, and 3% at G = 19. The per-Transit astrometry is accurate to 55 mas when compared to Gaia DR2. The Gaia Science Alerts project is one of the most homogeneous and productive transient surveys in operation, and it is the only survey which covers the whole sky at high spatial resolution (subarcsecond), including the Galactic plane and bulge. © S. T. Hodgkin et al. 2021

Desarrollo y estado actual del Banco de Recursos Genéticos de las razas autóctonas en peligro de extinción de ganado ovino en Aragón

La crioconservación de material reproductivo y la formación de Bancos de Recursos Genéticos Animales es fundamental en el desarrollo de los Programas de Mejora, Conservación y Fomento ganadero. Las Administraciones Públicas junto con las Asociaciones de Ganaderos son los principales actores en la creación de los mismos. El objeto de la comunicación pone de relieve las actuaciones que se están llevando a cabo para la creación del Banco de Recursos Genéticos (BRG) de razas autóctonas aragonesas de ganado ovino en peligro de extinciónPublishe