The different estimates are presented of average dry matter intake, in terms of quality and quantity, by adult cows grazing in the bunchgrass paramo of Parque Nacional Natural Los Nevados, Colombia. Plant and animal variables were measured and used in different equations to determine total forage intake. Total dry matter intake per cow, with a live weight of 417 kg is estimaed at 13.8 10.1 (+/- 1.8) and 11.4 kg per day for methods based on grazing behaviour, fecal excretion and maintenance and production requirements, respectively. The latter two figues are considered most reliable. For an average adult cow a productivity index of 35 kg per 100 kg of body weight per year is derived, which is low compared to other extensive grazing systems. Based on field observations of grazing behaviour, the botanical composition of cattle diet was determined. Average forage digestibility and crude protein content were 52% and 7.5% respectively. Differences in forage quality of the consumed plant groups correspond with the Ivlev's electivity index as a quantitative measure of forage selection. Short grasses, forbs, and ground-covering species are preferred to bunchgrasses.
