Table 1.

Median of optimal sample size for detecting different number of QTL signals from 100 repetitions of simulations

QTL	h2=0.1				h2=0.2				h2=0.3
	N=1	N=5	N=10	Single	N=1	N=5	N=10	Single	N=1	N=5	N=10	Single
1	128	126	127	195	57	58	57	91	34	33	34	56
2	275	269	273	382	125	126	122	175	73	70	73	106
3	421	426	436	569	214	201	205	259	126	120	120	155
4	613	540	584	756	291	288	281	342	177	170	170	204
5	763	713	685	943	385	349	344	426	228	208	207	253

Results are based on the multi-SNP approach (N=1,5,10 families) or single-SNP approach. In each repetition, sample size was repeatedly determined for randomly drawn QTL positions and the median was calculated