Cloning and expression profiling of the VLDLR gene associated with egg performance in duck (Anas platyrhynchos)

Table 2 Association of two haplotypes with duck egg performance

Haplotype	AT(219)	CG(382)	P value
210 day egg production (n)	79.18 ± 1.07^A	73.18 ± 0.81^B	< 0.0001**
300 day egg production (n)	158.46 ± 1.50^A	151.58 ± 1.14^B	0.0003**
360 day egg production (n)	211.48 ± 1.82^A	202.77 ± 1.38^B	0.0002**
Age at the first egg (d)	118.12 ± 1.04^A	123.11 ± 0.78^B	0.0001**
Body weight at the first egg (kg)	1.781 ± 0.015^a	1.824 ± 0.012^b	0.0277*
Egg weight (g)	65.41 ± 0.53	65.98 ± 0.42	0.4000
Haugh unit	80.99 ± 0.84	80.11 ± 0.65	0.4084
Egg index	1.345 ± 0.006	1.342 ± 0.005	0.6571
Percentage of yolk	0.310 ± 0.003	0.312 ± 0.003	0.6934
Percentage of albumen	0.544 ± 0.003	0.546 ± 0.002	0.5993
Shell strength (kgf·cm²)	4.471 ± 0.074	4.585 ± 0.057	0.2291

Note: within the same columns, values with different capital letters indicate extremely significant differences (P < 0.01) and values with different lower case letters indicate significant differences (P < 0.05); ** indicates an extremely significant association at P < 0.01 and * indicates a significant association at P < 0.05.

ISSN: 1297-9686