Table 2. Variance components and heritability estimates for the feed efficiency traits.

Trait1	σ2a	σ2e	h2 ± SE
Gain:feed	0.06	0.38	0.14 ± 0.06
RFI	0.08	0.28	0.24 ± 0.06
RFIb	0.07	0.29	0.20 ± 0.06
RFIsf	0.07	0.28	0.22 ± 0.06
RG	0.003	0.01	0.19 ± 0.06
RIG	0.45	2.44	0.15 ± 0.05
RIGb	0.34	2.53	0.11 ± 0.05
RIGsf	0.31	2.51	0.11 ± 0.05

RFI, residual feed intake; RFI_b, residual feed intake adjusted for backfat thickness; RFI_sf, residual feed intake adjusted for backfat and rump fat thickness; RG, residual body weight gain; RIG, residual intake and gain; RIG_b, residual intake and gain using RFI_b; RIG_sf, residual intake and gain using RFI_sf; σ²_a, additive genetic variance component; σ²_e, residual variance component; h², heritability; SE, standard error.