Genome-wide association scan for QTL and their positional candidate genes associated with internal organ traits in chickens

Table 1 Descriptive statistics, variance components and genomic heritability for internal organ traits in the Embrapa F₂ Chicken Resource Population

Trait	N	Average ± SD¹	Residual variance	Genetic variance	Total variance	Genomic heritability²
HWT	480	6.389 ± 1.694	1.149	0.131	1.279	0.10
HEARTP	480	0.658 ± 0.131	0.013	0.002	0.014	0.12
LIVWT	480	26.139 ± 5.308	7.481	0.565	8.046	0.07
LIVP	480	2.695 ± 0.326	0.068	0.014	0.082	0.17
GIZZWT	480	23.830 ± 4.533	6.398	5.309	11.707	0.45
GIZZP	480	2.476 ± 0.399	0.074	0.060	0.134	0.44
LUNGWT	479	8.222 ± 2.246	2.606	0.163	2.769	0.06
LUNGP	479	0.817 ± 0.165	0.027	0.003	0.030	0.10
INTES	479	153.056 ± 14.793	88.588	61.656	150.244	0.41

HWT: heart weight; HEARTP: heart percentage; LIVWT: liver weight; LIVP: liver percentage; GIZZWT: gizzard weight; GIZZP: gizzard percentage; LUNGWT: lung weight; LUNGP: lung percentage; INTES: intestine length (cm). All the weights are expressed in grams
¹Standard deviation of the mean
²Genomic heritability estimated with Bayes B model