An investigation was made into the return of dung to a bahiagrass pasture by Holstein heifers. Both daily excretion of dung dry weight and daily number of defecations were linearly and positively related to the daily dry matter intake of herbage and concentrate. Number of dung pats per defecation took relatively constant value (about 1.66). When the number of dung pats was counted dividing the pasture and resting place into 31 rectangles (about 60 m^2), proportion of dung pats to fall in each of the rectangles was explained by the distances between the rectangle and the resting place and between the rectangle and the opposite fence-line to the resting place. Both resting place and opposite fence-line to the resting place aggregated the dung pats. The dispersion pattern of dung pats within the rectangles of the pasture was in general well described by the Poisson distribution.