Viral nervous necrosis resistance in gilthead sea bream (Sparus aurata) at the larval stage: heritability and accuracy of genomic prediction with different training and testing settings

Table 2 Number of animals (N) in each group, average genomic relatedness (standard deviation SD) within group (g_{ij_w}) and average genomic relatedness (SD) between one group and the others (g_{ij_b}), for each cross-validation strategy

Cross-validation strategy	Group	N	g_{ij_w}	g_{ij_b}
Random	1	243	− 0.001 (0.113)	− 0.001 (0.114)
	2	243	− 0.001 (0.116)	− 0.001 (0.115)
	3	243	− 0.001 (0.114)	− 0.001 (0.115)
	4	243	− 0.001 (0.118)	− 0.001 (0.116)
K-means clustering	1	336	0.125 (0.099)	− 0.064 (0.070)
	2	177	0.239 (0.114)	− 0.054 (0.073)
	3	326	0.039 (0.100)	− 0.024 (0.069)
	4	133	0.258 (0.098)	− 0.043 (0.077)
Leave-one-family-out	Parents	54	0.015 (0.088)	− 0.002 (0.109)

For the leave-one-family-out validation, g_{ij_w} refers to the group of parents, whereas g_{ij_b} refers to the parents and the challenged fish

ISSN: 1297-9686