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Table 1 Basic statistics (LS Means ± Standard Error) for all traits analysed (N ranging from 481 to 602 according to the trait).

From: Improving the efficiency of feed utilization in poultry by selection. 2. Genetic parameters of excretion traits and correlations with anatomy of the gastro-intestinal tract and digestive efficiency

Traits D+ D- D+/D- ratio (%) Significance of line effect
BW23 490 ± 3.62 428 ± 3.62 14.5 < 0.001
WG 166 ± 1.69 146 ± 1.69 13.7 < 0.001
FI 285 ± 3.13 363 ± 3.18 -21.5 < 0.001
FCR 1.72 ± 0.03 2.72 ± 0.03 -36.8 < 0.001
CDUDM 75.4 ± 0.56 58.8 ± 0.56 28.2 < 0.001
FEW 245 ± 11.7 417 ± 11.8 -41.3 < 0.001
DEW 70.3 ± 3.27 153 ± 3.29 -54.1 < 0.001
FEW/BW 0.53 ± 0.04 1.04 ± 0.04 -49.0 < 0.001
DEW/BW 0.13 ± 0.01 0.33 ± 0.01 -60.6 < 0.001
FEW/FI 0.85 ± 0.03 1.16 ± 0.03 -26.7 < 0.001
WE 71.0 ± 0.53 65.8 ± 0.53 7.90 < 0.001
NE/NI 0.41 ± 0.01 0.63 ± 0.01 -34.9 < 0.001
PE/PI 0.47 ± 0.01 0.58 ± 0.01 -19.0 < 0.001
NE/PE 3.46 ± 0.04 4.34 ± 0.04 -20.3 < 0.001
  1. 1 BW23, body weight at 23 d of age (g); WG, body weight gain between 17 and 23 d of age (g); FI, feed intake between 17 and 23 d of age (g); FCR, feed conversion ratio between 17 and 23 d (g.g-1); CDUDM, coefficient of digestive use of dry matter (g); FEW, fresh excreta weight (g); DEW, dry excreta weight (g); FEW/BW and DEW/BW, fresh and dry excreta weight relative to body weight at 23 d; FEW/FI, fresh excreta weight relative to feed intake(g.g-1); WE, water content of excreta (%); NE/PE, ratio of nitrogen to phosphorus excretion (g.g-1); NE/NI, PE/PI, nitrogen and phosphorus excreted relative to nitrogen and phosphorus intake (g.g-1)