In Chile there is little information Oil nutrient losses in livestock systems. The experiment was carried out between 2004 and 2006. Two stocking rates (3.5 and 5.0 steers ha(-1)) were tested under rotational grazing with Black and White Friesian steers oil a permanent pasture (67.5 kg N and 40 kg P ha(-1) yr(-1)). To quantify Surface runoff losses (N, P, K), three surface lysimeters (5 x 5 m) per treatment were established. N and K leaching losses were estimated with ceramic CLIPS. Runoff and leachate samples were individually analyzed for available and total N, reactive (RP) and total P, and K. Dissolved organic N (DON) and organic P (OP) were estimated as the difference between total and available forms. The stocking, rate did not increase total N, P and K losses (P > 0.05). Losses in surface runoff were < 0.5 kg N, < 0.05 kg 11, and < 0.6 kg K ha(-1) yr(-1). respectively, due to the low amount of runoff measured. Nitrogen leaching losses were high (11 up to 71 kg ha(-1) yr(-1)) and K leaching losses were low (3 to 5 kg ha(-1) yr(-1)). Nitrogen in runoff was mainly lost as DON (50%). Nitrogen leaching losses were mainly as nitrate (70%). Phosphorus was lost as RP (70%). Thus, stocking rates of 5.0 steers ha(-1) are plausible. but fertilizer application Should be avoided in rainfall periods during the year to reduce incidental nutrient losses.