Integration of beef cattle international pedigree and genomic estimated breeding values into national evaluations, with an application to the Italian Limousin population

Table 7 Validation of the scenarios’ predictivity for direct EBV of offspring of publishable sires and for maternal EBV of daughters of MGS with publishable EBV when EBV_INT are computed using single-step international evaluations^a

Validation group^b	EBV	Scenario	ρ	LB (GSD)	b₁	R²_adj	RMSE (GSD)
Offspring of sires with publishable direct EBV (n = 1016)	Direct EBV	NAT_APR	0.96	− 0.17	0.94	0.91	0.13
	Direct EBV	BLEND_APR	0.99	− 0.05	1.01	0.98	0.06
	Maternal EBV	NAT_APR	0.99	0.07	1.01	0.97	0.06
	Maternal EBV	BLEND_APR	0.99	0.00	1.02	0.98	0.05
Offspring of sires with publishable direct and maternal EBV (n = 60)	Direct EBV	NAT_APR	0.94	− 0.20	0.98	0.88	0.16
	Direct EBV	BLEND_APR	0.99	− 0.06	1.01	0.97	0.08
	Maternal EBV	NAT_APR	0.99	0.07	1.00	0.98	0.05
	Maternal EBV	BLEND_APR	0.98	0.00	0.94	0.95	0.08
Daughters of MGS with publishable direct and maternal EBV (n = 740)	Direct EBV	NAT_APR	0.94	− 0.13	0.97	0.89	0.15
	Direct EBV	BLEND_APR	0.99	− 0.04	1.01	0.98	0.06
	Maternal EBV	NAT_APR	0.99	0.05	1.01	0.98	0.05
	Maternal EBV	BLEND_APR	0.99	− 0.01	0.99	0.98	0.06

NAT_APR national evaluation without integration, BLEND_APR blended national evaluation with integration of publishable sires’ international information and correction for double-counting
ρ Pearson correlation of EBV, LB (GSD) level bias (in genetic standard deviations), b₁ slope, R²_adj adjusted R², RMSE (GSD) root mean square error (in genetic standard deviations)
^aThe EBV of different scenarios are compared with single-step EBV of scenario REF_APR (international evaluation including national data until April 2019 and foreign data until April 2019)
^bValidation group = offspring of publishable sires for direct EBV, and for direct and maternal EBV, with records in Italy born between January 2019 and April 2019. Daughters of MGS with publishable direct and maternal EBV: maternal grand-sires’ daughters having recorded offspring in Italy born between January 2019 and April 2019

ISSN: 1297-9686