SummaryThe original 24,900 km 2 distribution of the Cauca Guan Penelope perspicax is currently reduced to less than 750 km 2 . In addition, forest within this range is fragmented and populations are isolated. We conducted surveys to determine the presence of the Cauca Guan at several locations within its present range, and mapped all known localities with guan records. Cauca Guan populations are confirmed to occur at only four sites, and the guan is absent from several localities with historic records. Some sites where the Cauca Guan is potentially present are highlighted. In particular, the possible existence of populations on the Pacific slope of the Andes requires confirmation, since a large habitat block is available. Population density estimates were obtained in two protected areas. In Yotoco Forest Reserve (559 ha) we estimated 8.6 guans km 22. At Otú n-Quimbaya Flora and Fauna Sanctuary (489 ha), guans fed seasonally on leaves of Chinese ash Fraxinus chinensis, an exotic tree planted in a revegetation programme. Seasonal densities in ash plantations were over 100 guans km 22, whereas in mixed forest, mean density was 41.6 birds km 22. Ash has apparently become a key resource for this population. Although these two populations are within protected areas and have relatively high densities, they are small and isolated and require continued monitoring.
ResumenEl objetivo de esta investigación fue medir la eficiencia relativa de fincas ganaderas a las cuales se les presta el servicio de asistencia técnica, ubicadas en los municipios de Duitama, Belén, Cerinza y Paipa en el departamento de Boyacá (Colombia). Para el desarrollo de esta investigación se usó la metodología Data Envelopment Analysis -DEA. La asistencia se realizó a 121 fincas, las cuales se convirtieron en la población objeto de esta investigación. A nivel de los resultados se evidenció que en más del treinta y cinco por ciento de las fincas el índice de eficiencia es superior al 60 % y para el 25 % de estas fincas su eficiencia es superior al 90 %. Palabras clave: Medición de eficiencia; DEA; Explotación agrícola familiar; Eficiencia en fincas ganaderas. MeAsUReMent oF ReLAtiVe eFFiciencY oF cAttLe FARMs WitH tecHnicAL sUPPoRt AbstractThe objective of this research was to measure the relative efficiency of cattle farms that are provided with technical support. Located in the municipalities of Duitama, Belen, Cerinza and Paipa in the department of Boyaca (Colombia). For the development of this research Data Envelopment Analysis -DEA methodology was used. The technical support was performed at 121 farms which became the target population of this research. As a result it was shown that in more than thirtyfive percent of the farms the efficiency ratio is above 60% and for 25% of these farms efficiency is over 90%.
Este artículo fue aprobado para publicación en el v68n3 de la Revista de la Facultad de Medicina teniendo en cuenta los conceptos de los pares evaluadores y los cambios realizados por los autores según estos conceptos. Por lo tanto, se publica la versión preliminar del artículo para su consulta y citación provisional, pero debe aclararse que esta puede diferir del documento final, ya que no ha completado las etapas finales del proceso editorial (corrección de estilo, traducción y diagramación) y solo los títulos, datos de autores, palabras clave y resúmenes corresponden a la versión final del artículo.Esta versión puede consultarse, descargarse y citarse según se indique a continuación, pero debe recordarse que el documento final (PDF, HTML y XML) puede ser diferente.
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