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

Table 6 Selection proportions and resulting selection intensities for ewe and ram lambs in different tiers

Parameter	Nucleus		Multiplier		Commercial
Parameter	Ewes	Rams	Ewes	Rams^b	Ewes	Rams^c
Selection proportion^a	0.70	0.05	0.80	0.20	0.00	0.30
Selection intensity (i)	0.49	2.06	0.35	1.40	0.00	1.16

^aProportion of candidates selected to potentially become a replacement ewe or a breeding ram
^bRams selected in the nucleus to mate ewes in the multiplier tier
^cRams selected in the multiplier to mate ewes in the commercial tier

ISSN: 1297-9686