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Table 2 Elementary statistics and heritability of the traits related to digestive efficiency and anatomy of digestive tract estimated in F2

From: Detection of QTL controlling digestive efficiency and anatomy of the digestive tract in chicken fed a wheat-based diet

Trait1

Mean

Standard deviation

h2

AMEn (kcal.kg-1 DM)

3287

234.00

0.36

CDUDM (%)

70.10

4.82

0.29

CDUS (%)

95.96

4.84

0.33

CDUL (%)

76.86

12.28

0.29

CDUP (%)

81.71

3.89

0.40

RPW (%)

0.80

0.40

0.31

RGW (%)

2.10

0.70

0.64

RPGW (%)

2.83

0.53

0.21

RIW (%)

5.36

0.70

0.20

RIL (cm.g-1)

0.26

0.03

0.37

ID (g.cm-1)

0.21

0.03

0.30

PG/I (g.g-1)

0.54

0.18

0.44

BW23 (g)

451.46

58.50

0.23

  1. 1AMEn: metabolisable energy value of diet, corrected to 0 nitrogen retention; CDUDM: coefficient of digestive utilization of dry matter; CDUS: coefficient of digestive utilization of starch; CDUL: coefficient of digestive utilization of lipids; CDUP: coefficient of digestive utilization of proteins; RGW: relative gizzard weight to body weight at 23 days of age; RPW: proventriculus weight relative to body weight at 23 days of age; RIW: intestine weight relative to body weight at 23 days of age; RIL: intestine length relative to body weight at 23 days of age; ID: intestinal density; RPGW: proventriculus plus gizzard weight relative to body weight at 23 days of age; PG/I: ratio of gizzard and proventriculus weights to intestine weight at 23 days of age; BW23: body weight at 23 days of age.