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Table 1 Effects of RFI line and hygiene conditions on growth performance of pigs

From: Tissue-specific responses of antioxidant pathways to poor hygiene conditions in growing pigs divergently selected for feed efficiency

Line

Low RFI

High RFI

P values

Hygiene

Good

Poor

Good

Poor

MSE

Line

Hygiene

LxH

Period 1 (n = 71)

 BW W0

27.9

28.0

24.7

25.0

3.2

< 0.001

0.80

0.93

 BW W6

62.5

58.6

55.6

48.1

6.2

< 0.001

0.006

0.23

 ADG

808c

717bc

762b

537a

115

< 0.001

< 0.001

0.08

Proportions of tissues

 SCAT

5.0

4.7

5.0

4.7

0.7

0.91

0.18

0.96

 PRAT

0.56

0.48

0.48

0.39

0.11

0.02

0.02

0.99

 Liver

2.3

2.3

2.6

2.7

0.2

0.005

0.56

0.71

 LL

5.5bc

5.8c

5.3ab

5.1a

0.4

0.002

0.75

0.07

Period 2 (n = 35)

 BW W12

102.4

90.8

98.8

81.1

10.0

0.06

0.002

0.38

 End BW

111.0

100.2

110.2

90.1

9.4

0.10

< 0.001

0.17

 ADG

888

774

959

832

147

0.21

0.02

0.88

Proportions of tissues

 SCAT

6.8

6.2

6.7

5.8

1.5

0.65

0.14

0.71

 PRAT

0.86

0.87

0.92

0.67

0.22

0.31

0.15

0.11

 Liver

1.61

1.72

1.98

2.11

0.17

< 0.001

0.04

0.90

 LL

5.7

5.6

5.5

5.3

0.6

0.20

0.39

0.53

  1. Pigs from two lines divergently selected for low (LRFI) or high (HRFI) residual feed intake (RFI) were housed either in good or poor hygiene conditions during the first 6 weeks (W) after their transfer in growing-finishing pens (period 1, challenge). Half of these pigs were killed at week 6 (W6: n = 20 LRFI pigs in good conditions, n = 20 HRFI pigs in good conditions, n = 15 LRFI pigs in poor conditions, n = 16 HRFI pigs in poor conditions). Another half were placed in good hygiene conditions until slaughter at weeks 13 or 14 (period 2, recovery: n = 10 LRFI pigs from good conditions, n = 10 HRFI pigs from good conditions, n = 7 LRFI pigs from poor conditions, n = 8 HRFI pigs from poor conditions). Body weight (BW, kg) at week 0 (W0), 12 (W12) and just before slaughter (end BW) were individually assessed. Average daily gain (ADG, g/d) was calculated during the two periods. Tissues (LL: longissimus lumborum muscle; PRAT: perirenal adipose tissue, SCAT: subcutaneous adipose tissue) were weighed at slaughter, and expressed in proportion to BW. Letters (a,b,c) were added in case of interaction (LxH; P < 0.10) between hygiene (H) and RFI line (L), and means sharing a common letter did not differ. MSE: root mean standard error of the statistical model. Bold face highlights significant differences (P ≤ 0.05) between treatments, and when italicized, this denotes a trend (0.05 < P ≤ 0.10)