Fig. 4

Positive selection scans for adaptation to warm-temperature areas. Sheep from warm-temperature areas are compared with those from mid-temperature areas. The population genetic differentiation Fst values (a) and XP-EHH (b) within 50,000 bp sliding windows. The significant threshold for signatures of selection was set as the top 5% outliers for each test. The strongest positive signatures of selection are around the peak of the TSHR gene. The XP-EHH value (c), Tajima’s D (d) and πratio (e) are plotted against the peak position from 89 to 92 Mb on chromosome 7 within the 50,000-bp sliding window. The dark gray columns represent the strongest signatures of selection in this region