Productivity of mule deer (Odocoileus hemionus Raf.) populations is closely linked to individual nutritional condition. We modeled body fat of individual does as a function of vegetation cover, composition, and water characteristics of their annual, summer, and winter home ranges in north-central New Mexico. We also modeled home range size as a function of the same characteristics. Levels of body fat were most closely and negatively related to the amount of pinyon-juniper in an individual deer's annual home range (F 1,21 5 7.6; P 5 0.012; r 2 5 0.26). Pinyon-juniper types provided little (combined ground cover of preferred forbs and shrubs 5 5.7%) mule deer forage but were included in home ranges in excess of their availability on the landscape, likely because of security cover attributes. Proportion of grasslands in home ranges was most strongly related to both annual (F 1,23 5 4.9; P 5 0.037; r 2 5 0.18) and summer (F 2,25 5 5.7; P 5 0.009; r 2 5 0.31) home range sizes, and home ranges increased as the grassland component increased, indicating that this habitat type was providing little value to mule deer. Grassland (0.2% combined cover of preferred forb and shrub) and montane conifer (3.2% ground cover of preferred forb and shrub) habitat types similarly lacked preferred mule deer food, and grasslands also lacked cover. Most immediate gains in mule deer habitat in north-central New Mexico may be attained by management of pinyon-juniper communities to increase forage quantity and quality while maintaining cover attributes. Gains can also be realized in grasslands, but here management must establish both cover and forage. Resumen La productividad de las poblaciones de venado Bura (Odocoileus hemionus Raf.) esta estrechamente relacionada a la condición nutricional individual. Modelamos la grasa corporal de las hembras en función de la cobertura vegetal, composición y las características del agua de los pastizales anuales de verano e invierno de su territorio en la región norte-centro de New Mexico y tambie´n modelamos el tamañ o de su territorio en función de las mismas características. Los niveles de grasa corporal estuvieron más estrecha y negativamente relacionados a la cantidad de ''Pinyon-juniper'' en el territorio anual individual del venado (F 1,21 5 7.6; P 5 0.012; r 2 5 0.26). Los tipos de ''Pinyon-juniper'' suministraron (combinado con la cobertura de las hierbas y arbustos preferidos 5 5.7%) poco forraje al venado Bura, pero estuvieron incluidos en el su territorio de pastizal en exceso en relación a su disponibilidad en el paisaje, probablemente por los atributos de seguridad de la cobertura. La proporción de zacatal en el pastizal territorial estuvo más estrechamente correlacionada al tamañ o de los pastizales territoriales anual (F 1,23 5 4.9; P 5 0.037; r 2 5 0.18) y de verano (F 2,25 5 5.7; P 5 0.009; r 2 5 0.31), y los territorios se incrementaron conforme el componente zacatal aumentó, indicando que este tipo de hábitat fue de poco valor para el venado Bura. Los tipos de hábitat de zacatal (0.2%...
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