Table 3. Estimated expected genetic gains obtained using the PSI and the GSI for simulated data sets 1 and 2, respectively, for four traits (T1, T2, T3, and T4), when the generation interval is ignored and when it is included^a.

Cycles	PSI Estimated Expected Genetic Gains								GSI Estimated Expected Genetic Gains
	Generation Interval Ignored				Generation Interval Included				Generation Interval Ignored				Generation Interval Included
	T1	T2	T3	T4	T1	T2	T3	T4	T1	T2	T3	T4	T1	T2	T3	T4
1	7.9	−4.7	3.3	1.9	2.0	−1.2	0.8	0.5	6.6	−3.5	2.7	1.6	4.4	−2.3	1.8	1.1
2	7.1	−3.6	3.2	1.9	1.8	−0.9	0.8	0.5	6.3	−3.4	2.6	1.5	4.2	−2.3	1.7	1.0
3	6.7	−3.2	2.8	1.5	1.7	−0.8	0.7	0.4	6.1	−3.3	2.7	1.5	4.1	−2.2	1.8	1.0
4	7.5	−3.5	2.1	1.3	1.9	−0.9	0.5	0.3	5.6	−3.1	2.3	1.3	3.7	−2.1	1.5	0.9
5	7.1	−2.7	2.5	1.3	1.8	−0.7	0.6	0.3	5.2	−2.8	2.1	1.3	3.5	−1.9	1.4	0.9
6	6.2	−2.6	2.0	1.2	1.6	−0.7	0.5	0.3	4.9	−2.6	1.9	1.3	3.3	−1.7	1.3	0.9
7	5.4	−2.5	2.5	1.2	1.4	−0.6	0.6	0.3	5.2	−2.7	2.1	1.2	3.5	−1.8	1.4	0.8
Average	6.8	−3.3	2.6	1.5	1.7	−0.8	0.7	0.4	5.7	−3.1	2.3	1.4	3.8	−2.0	1.6	0.9

We conducted eight selection cycles (including cycle 0) with PSI and seven (from cycle 1 to 7) with GSI. The average responses and genetic gains from cycle 1 to 7 are shown in the last line of the table. PSI, phenotypic selection index; GSI, genomic selection index.

^aFor PSI, the time required to complete one selection cycle is 4 years; for GSI, the time required to complete one selection cycle is 1.5 years.