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Table 2 Performances of egg production in France

From: Performance comparison of dwarf laying hens segregating for the naked neck gene in temperate and subtropical environments

  Control line Selection line
Traits NA*N/NA*N 1 NA*NA/NA*N NA*NA/NA*NA NA*N/NA*N NA*NA/NA*N NA*NA/NA*NA
(Number of birds) (20) (56) (31) (43) (93) (44)
Body weight at 16 weeks, g 1420 ± 372 1435 ± 16 1443 ± 33 1457 ± 21 a 1441 ± 18 a 1371 ± 18 b
Age at first egg, day 139.5 ± 4.0 135.5 ± 1.2 139.4 ± 1.7 130.1 ± 1.2 133.8 ± 2.1 132.8 ± 1.2
Clutch length, egg 2.93 ± 0.24 3.32 ± 0.18 3.11 ± 0.20 13.35 ± 1.76 13.67 ± 0.86 11.93 ± 0.92
Clutch length (Trans.) 6.69 ± 0.50 7.38 ± 0.29 7.04 ± 0.40 14.01 ± 0.32 13.96 ± 0.30 13.62 ± 0.36
Egg number at 44 weeks 111.5 ± 8.1 123.0 ± 3.9 120.1 ± 5.0 167.4 ± 1.6 163.6 ± 2.8 157.8 ± 4.1
Egg number at 44 weeks (Trans.) 81.4 ± 7.1 92.0 ± 3.6 88.9 ± 4.8 139.5 ± 1.9 136.2 ± 2.7 129.5 ± 4.1
Laying rate, % 63.0 ± 4.4 68.9 ± 2.1 68.8 ± 2.7 91.0 ± 0.8 90.3 ± 1.2 87.0 ± 2.1
Adult body weight, g 2156 ± 71 2141 ± 39 2181 ± 67 2071 ± 27 a 2004 ± 26 ab 1924 ± 36 b
Egg weight, g 49.8 ± 1.1 b 51.8 ± 0.6 ab 52.4 ± 0.8 a 51.0 ± 0.6 51.2 ± 0.5 50.3 ± 0.5
  1. 1 NA*N/NA*N: normally feathered; NA*NA/NA*N: heterozygous naked neck; NA*NA/NA*NA: homozygous naked neck
  2. 2 The values are mean ± standard error
  3. a, bDifferent superscripts indicate significant difference within line at a given environment