Table 1 Summary of phenotypic data of bulls at end of feed intake trial.

From: An examination of skeletal muscle and hepatic tissue transcriptomes from beef cattle divergent for residual feed intake

Trait

High1(SD)

Low1(SD)

P value

Bulls

No. of animals

5

5

˗

DMI, kg DM/d

10.1 (0.52)

8.4 (0.47)

0.02

RFI, kg DM/d

0.6 (0.05)

− 0.7 (0.04)

0.009

Metabolic bodyweight0.75, kg2

96.3 (5.19)

94.5 (7.82)

0.74

Initial bodyweight, kg

375.1 (32.35)

376.9 (34.44)

0.9

Final bodyweight, kg

511.8 (27.65)

496.6 (24.31)

0.62

ADG, kg/d

1.9 (0.33)

1.7 (0.29)

0.46

Backfatchange3, mm

1.5 (0.28)

1.5 (0.36)

0.63

Heifers

No. of animals

5

5

˗

DMI, kg DM/d

9.8 (0.63)

8.6 (0.46)

0.03

RFI, kg DM/d

0.4 (0.05)

− 0.3 (0.02)

< 0.0001

Metabolic bodyweight0.75, kg2

91 (4.74)

92 (5.52)

0.89

Initial bodyweight, kg

368 (17.90)

361 (26.57)

0.73

Final bodyweight, kg

466 (18.58)

449 (27.28)

0.93

ADG, kg/d

1.3 (0.41)

1.4 (0.24)

0.59

Back fat change3, mm

1.3 (1.32)

1.2 (0.51)

0.16

  1. 1High RFI is inefficient and low RFI is efficient.
  2. 2Metabolic BW0.75, kg is determined as BW0.75 in the middle of the RFI measurement period which was estimated from the intercept and slope of the regression line after fitting a linear regression line through all metabolic BW (BW0.75) observations.
  3. 3Back fat change is mean of the fat depth at end of intake trial—mean of fat depth at start of intake trial.
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