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Table 3 Performances of egg production in Taiwan

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) (25) (36) (16) (49) (59) (31)
Body weight at 16 weeks, g 1360 ± 382,a 1295 ± 32 ab 1261 ± 21 b 1213 ± 23 a 1213 ± 19 a 1143 ± 24b
Age at first egg, day 157.6 ± 2.6 a 160.7 ± 2.8 ab 167.4 ± 3.1 b 153.4 ± 2.0 152.2 ± 1.4 157.4 ± 2.6
Clutch length, egg 2.60 ± 0.17 2.27 ± 0.11 2.09 ± 0.15 5.53 ± 0.40 6.50 ± 0.52 5.46 ± 0.62
Clutch length (Trans.) 6.11 ± 0.35 5.30 ± 0.28 4.81 ± 0.44 9.85 ± 0.39 10.34 ± 0.42 9.68 ± 0.51
Egg number at 44 weeks 80.8 ± 5.2 76.8 ± 4.1 76.7 ± 4.9 112.4 ± 3.7 110.9 ± 4.1 107.4 ± 3.5
Egg number at 44 weeks (Trans.) 51.7 ± 4.3 48.2 ± 3.4 47.5 ± 4.1 81.1 ± 3.4 80.3 ± 3.7 75.5 ± 3.4
Laying rate, % 53.7 ± 3.3 52.3 ± 2.6 54.4 ± 3.1 72.6 ± 2.1 71.0 ± 2.5 71.4 ± 2.2
Adult body weight, g 1720 ± 42 1748 ± 41 1677 ± 36 1587 ± 28 1585 ± 25 1551 ± 37
Egg weight, g 48.3 ± 0.5 49.5 ± 0.7 49.6 ± 0.9 46.6 ± 0.4 b 47.2 ± 0.5 b 49.3 ± 0.6 a
  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 differences within lines at a given environment