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Table 2 Estimated genetic parameters (± standard errors) for 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).

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
BW23 0.28 ± 0.04
0.15 ± 0.01
0.99 ± 0.01 0.66 ± 0.06 0.24 ± 0.06 -0.24 ± 0.06 0.70 ± 0.05
WG   0.30 ± 0.06 0.60 ± ne2 0.24 ± 0.07 -0.35 ± ne 0.54 ± ne
FI    0.47 ± 0.05 -0.66 ± 0.05 0.64 ± ne 0.99 ± ne
AMEn     0.30 ± 0.02
0.08 ± 0.01
-0.98 ± 0.02 -0.60 ± 0.06
FCR      0.21 ± 0.02
0.06 ± 0.01
0.57 ± ne
RFI       0.46 ± 0.06
  1. 1 Estimates of heritability (h2) on the diagonal in bold; maternal permanent environmental effects (c2) on diagonal in italics; genetic correlations (rg) above diagonal. 2 ne: not estimated.