Ninety-six female pigs with an initial body weight (BW) of 10.0±1.6kg were assigned to 4 dietary treatments to determine the effects of restricting dietary phosphorus (P) level during the weaner-grower [approximately 10 to 50kg BW; day (d) 0 to 59] and finisher (approximately 50 to 100kg BW; d 59 to 131) period on growth performance, serum osteocalcin concentration, bone development and calculated P utilization. The dietary treatments were: (1) 4.0gtotalP (tP)/kg from d 0 to 131 (LL); (2) 4.0gtP/kg from d 0 to d 59 and 6.0gtP/kg from d 59 to 131 (LH); (3) 6.0gtP/kg from d 0 to 131 (HH) and (4) 6.0gtP/kg from d 0 to 59 and 4.0gtP/kg from d 59 to 131 (HL). During the weaner-grower period (d 0 to 59), pigs offered high P diets had higher daily gain (P