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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