The results of this study suggests that the average net requirements of Ca and P for the Iberian pig growing
from 15 to 50 kg BWat the maximum rate of 0.555 kg/d, corresponding to a pig fed at 0.95× ad libitum, calculated
as the sum of mineral retained with growth and total endogenous losses, would be 5.25 [(7.43×0.555)+1.13]
and 3.10 [(4.08×0.555)+0.84] g/d respectively. These estimations are considerably lower than those which can
be extrapolated from corresponding values reported by ARC (1981) for conventional and high-performance pig
genotypes. Further studies to examine the effect on growth, bone mineral content and other bone-related variables,
such as bone density or breaking strength, of Ca and P dietary levels based on the net requirements calculated in
the present work are needed to confirm the adequacy of our present estimates for the growing Iberian pig.