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Table 3 Ram age structure in different tiers of the breeding scheme supporting the commercial tier

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

Age of rams (years)

Proportions of ram age groups in the flock (ρ s=f )

Probability of a ram surviving to age group i given presence in age group 1 (α i )

Nucl

Mult

Comm

Nucl

Mult

Comm

1

0.35

0.28

0.28

1.00

1.00

1.00

2

0.30

0.27

0.27

0.86

0.95

0.95

3

0.15

0.25

0.25

0.43

0.90

0.90

4

0.10

0.20

0.20

0.29

0.72

0.72

5

0.05

0.00

0.00

0.14

0.00

0.00

6

0.05

0.00

0.00

0.14

0.00

0.00

  1. Nucl is the nucleus tier of the breeding scheme, Mult is the multiplier tier and Comm is the commercial tier