A survey was carried out on 19 dairy farms in Manitoba that varied in size, diet composition, housing, and feeding strategy to identify factors that affect the phosphorus (P) content of feces. On each farm, 10 early, 10 mid, and 10 late lactation cows were included. Multiple regression analysis showed that high dietary P concentrations and free-stall instead of tie-stall housing were mostly associated with high P contents of feces. Hence, a closer matching of the requirements and supply of P of dairy cows enhances the utilization of dietary P on these farms.