FIGURE 6.

Demographic model of DHB breed formation. (a) Simple demographic model of DHB breed formation. In this model, DHB was derived from small‐sized breeds from the south with introgression of pigs from the north. (b) A two‐step introgression demographic model of DHB breed formation. In this model, GX and SZL served as agents for initial introgression, and a second wave of introgression from GX and SZL migrated to the south and produced DHB. (c) Breeds migration route map. The color and size of the pie chart are the same as in Figure 2a