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Table 4 Genetic correlations (± standard errors) between body weight at 23 d (BW23), body weight gain (WG), feed intake (FI), apparent metabolisable energy (AMEn), feed conversion ratio (FCR) and residual feed intake (RFI) and characteristics of GIT morphology.

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

Trait1 BW23 WG FI AMEn FCR RFI
CW -0.18 ± 0.21 -0.16 ± 0.21 0.19 ± 0.18 0.05 ± 0.09 0.18 ± 0.20 0.24 ± 0.18
PRW -0.53 ± 0.28 -0.75 ± 0.11 -0.11 ± ne 0.59 ± 0.22 -0.25 ± ne2 -0.67 ± 0.48
GZW -0.45 ± 0.15 -0.51 ± ne -0.36 ± 0.15 0.43 ± 0.12 -0.19 ± ne -0.47 ± ne
LW -0.90 ± 0.10 -0.99 ± ne -0.64 ± ne -0.49 ± 0.18 0.53 ± 0.28 -0.32 ± 0.16
DW -0.50 ± 0.15 -0.50 ± 0.12 0.08 ± 0.13 -0.36 ± 0.08 0.36 ± 0.09 0.02 ± 0.14
JW -0.45 ± 0.15 -0.54 ± 0.13 0.05 ± 0.12 -0.67 ± 0.07 0.55 ± 0.09 0.02 ± 0.13
IW -0.42 ± 0.13 -0.63 ± 0.10 0.03 ± 0.10 -0.77 ± 0.06 0.66 ± 0.08 -0.03 ± ne
DL -0.94 ± 0.02 -0.83 ± 0.08 -0.46 ± ne -0.05 ± 0.07 -0.05 ± ne -0.47 ± 0.10
JL -0.96 ± 0.02 -0.90 ± ne -0.58 ± ne -0.10 ± 0.07 0.07 ± 0.09 -0.60 ± 0.09
IL -0.95 ± 0.02 -0.98 ± 0.01 -0.60 ± 0.10 -0.05 ± 0.07 0.01 ± ne -0.63 ± ne
DD 0.76 ± 0.08 0.37 ± ne 0.58 ± ne -0.30 ± 0.07 0.25 ± 0.08 0.54 ± 0.10
JD 0.60 ± 0.13 0.28 ± ne 0.49 ± ne -0.39 ± 0.07 0.32 ± 0.07 0.51 ± 0.10
ID 0.58 ± 0.10 0.25 ± ne 0.52 ± ne -0.52 ± 0.07 0.47 ± 0.07 0.53 ± 0.10
  1. 1CW, PRW, GZW, LW, DW, JW, IW, weights of crop, proventriculus, gizzard, liver, duodenum, jejunum and ileum in relation to BW; DL, JL, IL, lengths of duodenum, jejunum and ileum in relation to BW; DD, JD, ID, density of duodenum, jejunum and ileum. 2 ne: not estimated.