Table S1.

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