Impacts of both reference population size and inclusion of a residual polygenic effect on the accuracy of genomic prediction

Table 8 Estimates of the coefficient of regression of deregressed EBV on combined genomic value (GEBV) for the validation bulls using the EuroGenomics reference population

Trait	Scenarios for percent of residual polygenic variance
	M^§	5%	10%	20%
Milk yield	0.93	1.17	1.26	1.40
Fat yield	0.96	1.15	1.24	1.38
Protein yield	0.89	1.13	1.23	1.37
Somatic cell score	0.97	1.13	1.21	1.34
Longevity	0.97	0.83	0.90	1.00
Stature	0.91	1.00	1.09	1.21
Rump angle	0.96	1.05	1.12	1.22
Rump width	0.83	0.84	0.89	0.97
Udder depth	1.01	1.19	1.26	1.36
Body conditional score	0.95	0.94	1.00	1.09
Milking speed	1.01	1.06	1.11	1.19

^§M: the genomic model with the lowest residual polygenic variance assumes a residual polygenic heritability of 0.0001

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