Residual feed intake of P2 animals (RFI2) was defined
as follows:
RFI2, g = DFI2, g − (1.48 × ADG2, g)
+ (23.2 × LMC, %) − (99.1 × AMBW, kg),
where AMBW is the average metabolic BW during the
test period (Noblet et al., 1999) and is equal to (BW11.6 −
BW01.6)/[1.6 (BW1 − BW0)].