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Averages of GI in years for four paths of selection (SB, SC, DB, and DC) for ranges of birth years of the progeny of that selection path
| Birth year of progeny | |||||||
| Selection path | 1981–1985 | 1986–1990 | 1991–1995 | 1996–2000 | 2001–2005 | 2006–2010 | 2011–2015 |
| SB | 7.7 | 8.0 | 7.3 | 6.8 | 6.8 | 5.5 | 2.6 |
| SC | 6.8 | 7.3 | 7.1 | 6.8 | 6.8 | 6.3 | 5.2 |
| DB | 5.3 | 5.1 | 4.4 | 4.2 | 4.2 | 3.7 | 2.8 |
| DC | 4.2 | 4.2 | 4.1 | 4.0 | 3.9 | 3.7 | 3.5 |
