The Neijiang was raised in Southwest China in the Sichuan Basin in China, where the
climate is mild, agriculture is well developed, and the area is rich in feed supplies.
The pigs are comparatively large in size, with strong body constitution, thick skin
(about .7 cm) and thick back fat (3.4 to 5.7 cm). They are also precocious; the young boar may mount the female at as early an age as
2 months, and mature spermatozoa are found in the epididymis at 71 to 78 days; gilts
can be mated and become pregnant as early as 90 days after birth. The average litter
size is 10.6, and there are 7 pairs of teats.
Cheng, P. (1984) Livestock Breeds of China. Animal Production and Health Paper 46
(E, F, S). Publ. by FAO, Rome 217 pp.