Table 2 Performances of egg production in France
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 |