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Table 1 Basic statistics (LS Means ± Standard Deviation (Coefficients of Variation)) for all traits analysed (N ranging from 570 to 598 according to the trait).

From: Improving the efficiency of feed utilization in poultry by selection. 1. Genetic parameters of anatomy of the gastro-intestinal tract and digestive efficiency

Trait

D+

D-

D+/D-ratio (%)

Significance of line effect

   BW231

490 ± 64.5 (13.2)

428 ± 64.9 (15.2)

14.5

< 0.001

   WG

166 ± 30.6 (18.4)

146 ± 28.9 (19.8)

13.7

< 0.001

   FI

285 ± 41.8 (14.7)

363 ± 66.6 (18.3)

-21.5

< 0.001

   AMEn

3,278 ± 148 (4.52)

2,455 ± 533 (21.7)

33.5

< 0.001

   FCR

1.72 ± 0.39 (22.7)

2.72 ± 0.54 (19.9)

-36.8

< 0.001

   RFI

-33.2 ± 3.15 (9.49)

34.9 ± 3.2 (9.17)

-5

< 0.001

Weight 2

    

   Crop

4.78 ± 0.75 (15.7)

4.74 ± 0.77 (16.2)

0.84

0.620

   Proventriculus

8.19 ± 2.08 (25.4)

6.72 ± 1.39 (20.7)

21.9

< 0.001

   Gizzard

26.0 ± 4.2 (16.2)

19.4 ± 4.23 (21.8)

34.0

< 0.001

   Liver

34.0 ± 3.81 (11.2)

34.9 ± 3.67 (10.5)

-2.58

0.003

   Duodenum

12.7 ± 2.38 (18.7)

14.6 ± 2.32 (15.9)

-13.0

< 0.001

   Jejunum

17.2 ± 2.53 (14.7)

23.5 ± 3.46 (14.7)

-26.8

< 0.001

   Ileum

12.8 ± 1.98 (15.5)

17.9 ± 2.74 (15.3)

-28.5

< 0.001

Length 3

    

   Duodenum

49.7 ± 7.45 (15.0)

51.1 ± 7.45 (14.6)

-2.74

0.030

   Jejunum

87.7 ± 15.6 (17.8)

93.3 ± 14.9 (16.0)

-6.00

< 0.001

   Ileum

84.2 ± 16.1 (19.1)

87.4 ± 14.7 (16.8)

-3.66

0.019

Density 4

    

   Duodenum

0.26 ± 0.04 (15.4)

0.29 ± 0.04 (13.8)

-10.3

< 0.001

   Jejunum

0.20 ± 0.04 (20.0)

0.26 ± 0.04 (15.4)

-23.1

< 0.001

   Ileum

0.16 ± 0.03 (18.8)

0.21 ± 0.04 (19.0)

-23.8

< 0.001

  1. 1 BW23, body weight at 23 d (g); WG, body weight gain between 17 and 23 d (g); FI, feed intake between 17 and 23 d (g); AMEn, apparent metabolisable energy corrected for zero nitrogen balance (kcal.kg-1 DM); FCR, feed conversion ratio between 17 and 23 d (kg.kg-1); RFI, residual feed intake (g)
  2. 2 Weight, organ weight in relation to BW23 (g.kg-1);
  3. 3 Length, organ length in relation to BW23 (cm.kg-1);
  4. 4 Density, weight to length ratio (g.cm-1) of the different segments of the GIT
  5. 5 In this case, the difference between the lines is not relevant