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All issues Volume 67 / No 4 (June 2010) Ann. For. Sci., 67 4 (2010) 404 Full HTML
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Table II

Scenario A. Considerations of number of parents per grandparent (PGP). This table is for variants of the main scenario where annual cost per grandparent is 50 and PGP is variable. PF is the proportion of plants selected as parents for the breeding population.

Parameter (main scenario At optimum PGP % of optimum annual genetic gain at
value in parenthesis) the PPG given below
Value
P GP PF Annual gain, % 1∗ 2 4 5 6 8
Main scenario A (PGP = 6) Table I 6∗∗ 0.010 0.275 65 85 97 99 100 99
Additive variation coefficient at mature age (11) 5 6 0.010 0.125 65 85 97 99 100 99
15 6 0.010 0.375 65 85 97 99 100 99
Dominance variance (0.25) 0 6.5 0.011 0.294 61 83 97 99 100 99
1 5.5 0.009 0.239 72 89 99 100 100 98
Narrow-sense heritability (0.125) 0.05 6.5 0.011 0.221 50 78 96 99 100 98
0.2 5.5 0.009 0.311 74 90 99 100 100 98
0.5 3 0.004 0.439 93 99 99 98 96 91
1 1.5 0.002 0.694 99 100 95 92 88 81
Fixed cost per grandparent (100) 0 6.5 0.010 0.281 64 84 97 99 100 99
200 5.5 0.010 0.269 66 86 98 100 100 97
Cost of parent (50) 0 10.5 0.012 0.295 61 80 93 96 97 99
100 4.5 0.010 0.260 68 89 100 100 96 69
Annual budget per grandparent (50) 30 4 0.013 0.244 69 90 100 99 95 73
40 5 0.011 0.262 66 87 99 100 100 95
70 8 0.009 0.293 63 82 95 98 99 100
100 10 0.007 0.310 61 80 93 96 98 99
Weight for group coancestry (0)*** 100 6 0.010 0.275 65 85 97 99 100 99
Rotation age (70) 50 6 0.010 0.325 65 85 97 99 100 99
100 6 0.010 0.222 65 85 97 99 100 99
∗

Shows the unimproved strategy without the component of the among-family selection (equal number of parents and grandparents; corresponding to phenotype-based selection).

∗∗

Main scenario PGP = 6 was the optimum value for PGP with the main scenario parameter values.

***

For this scenario diversity loss is penalized with c = 100, thus the “value”of the forest is 0 if group coancestry is 1.