Genetic and economic benefits of selection based on performance recording and genotyping in lower tiers of multi-tiered sheep breeding schemes

Table 10 Index accuracies of selection for breeding ewes and rams mated in different tiers in alternative scenarios

Scenario	Nucleus		Multiplier		Multiplier to commercial
Scenario	Ewes	Rams	Ewes	Rams	Rams
Pheno + GS	0.43	0.49	0.43	0.49	0.49
Pheno + selective GS	0.43	0.49	0.43	0.49	0.49
Pheno + parentage	0.36	0.38	0.32	0.38	0.37
Phenotypic selection	0.36	0.38	0.18	0.21	0.14
Pheno + GS + open	0.53	0.49	0.53	0.49	0.49
Pheno + parentage + open	0.46	0.38	0.45	0.38	0.38
GS only	0.44	0.49	0.32	0.33	0.33
Selective GS only	0.44	0.49	0.32	0.33	0.33

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