Wild ancestry proportions per collection were calculated as the average individual wild admixture (q).
Using the results of the assignments, we examined temporal trends in the proportions of wild ancestry smolts in years 1998 through 2009, and wild ancestry adults returning to spawn in years 1999 through 2009.
Wild mixture proportions were calculated as the number of wild ancestry individuals divided by the total sample (including unassigned individuals).
Within Chinese pigs, from K = 3 to K = 7, variable fractions of Chinese wild ancestry were evidenced.
Individuals were assigned to either hatchery or wild ancestry by summing the probabilities of belonging to baseline collections.
Cohorts with more hatchery-produced parents also appeared to produce higher proportions of returning adult offspring of hatchery descent and lower proportions of wild ancestry smolts and adults.
The proportion of wild ancestry smolts and adults declined by 10 20% over the three generations since the hatchery program began.
Hatchery ancestry smolts showed a younger age distribution (i.e. more age 1) than wild ancestry smolts (χ(0.05,4) = 17.36, P = 0.002, Table S5).
