Table 4 The weight of the gastrointestinal tract in lambs with high, medium, and low residual feed intake (RFI).

42

54

41

Rumen

Absolute weight, g

546.39^b

587.49^a

587.02^a

5.09

0.001

Relative weight, %

62.26

61.51

61.20

0.31

0.455

Reticulum

Absolute weight, g

93.75^b

102.81^a

98.86^b

1.29

0.041

Relative weight, %

10.47

10.70

10.58

0.15

0.798

Omasum

Absolute weight, g

108.06

117.33

112.40

1.81

0.137

Relative weight, %

11.93

12.24

11.92

0.17

0.665

Abomasum

Absolute weight, g

144.94

149.52

152.59

2.16

0.427

Relative weight, %

16.00

15.55

16.31

0.24

0.321

Duodenum

Absolute weight, g

37.39

37.54

36.19

0.75

0.736

Relative weight, %

3.18

2.93

2.88

0.06

0.110

Jejunum

Absolute weight, g

764.01^b

811.72^a

785.63^ab

7.63

0.031

Relative weight, %

63.8

62.72

62.30

0.35

0.199

Ileum

Absolute weight, g

25.24

24.59

24.29

0.50

0.748

Relative weight, %

2.11

1.91

1.94

0.04

0.108

Cecum

Absolute weight, g

47.32

52.37

49.21

0.88

0.052

Relative weight, %

3.97

4.02

3.90

0.05

0.666

Colon

Absolute weight, g

320.39^b

372.38^a

369.41^a

7.23

0.005

Relative weight, %

26.94^b

28.41^b

28.97^a

0.35

0.060