Genetic analysis of production, physiological, and egg quality traits in heat-challenged commercial white egg-laying hens using 600k SNP array data

Table 1 Heritability (standard error) estimates for egg quality and body weight traits

Trait	Pre-heat	Acute^a	Week 1	Week 2	Week 3	Week 4
Albumen weight	0.15 (0.10)	0.39 (0.15)	0.42 (0.15)	0.23 (0.11)	0.19 (0.13)	0.05 (0.11)
Haugh units	0.26 (0.11)	0.15 (0.13)	0.59 (0.14)	0.24 (0.11)	0.07 (0.1)	0.40 (0.13)
Shell thickness	NC^b	0.28 (0.15)	0.14 (0.14)	0.05 (0.1)	NC^b	0.22 (0.16)
Shell weight	0.02 (0.1)	0.03 (0.12)	0.11 (0.15)	0.20 (0.11)	0.21 (0.13)	0.29 (0.15)
Yolk weight	0.09 (0.10)	0.08 (0.15)	0.16 (0.14)	0.06 (0.1)	0.09 (0.11)	0.11 (0.11)
Body weight	0.35 (0.11)	NA^c	NA^c	0.44 (0.10)	0.31 (0.10)	0.37 (0.11)

^aEggs collected the morning after the first heat cycle, such that they were formed during the first heat cycle
^bDoes not converge
^cTrait not measured at this time point

ISSN: 1297-9686