"Feral hogs are the most prolific large, wild mammal in North America.
With adequate nutrition, a feral hog population can double in 4 months.
Breeding occurs throughout the year when conditions are favorable, and sea-
sonally when food supply and nutrient quality vary. Females begin breeding
at about 8 to 10 months old, or as young as 6 months if food is abundant.
Under favorable conditions, sows can produce two litters every 12 to 15
months, with an average of four to eight piglets per litter and a sex ratio of
1:1. Younger sows tend to have smaller litters, while an older sow may have
as many as 10 to 13 piglets. Piglets are weaned in 2 to 3 months. Drought
and food shortages can delay breeding and reduce the number of piglets
born, but feral hog populations recover quickly when conditions improve."

Oregon says shoot on sight, and Calif. sells tags, go figure!