Pig management revealed by geometric morphometric analysis at the late Neolithic and Bronze Age Dinggong site in China

Abstract China was one of the earliest domestication centres for pigs in the Old World. Since their domestication, pigs have been significantly involved in human societies from both economic and ceremonial perspectives, so the investigation of pig domestication is key to understand the development process of ancient communities. However, the pig domestication process has not been fully explored in Shandong, one of the earliest regions for exploiting pig resources, such as canine teeth, in China. We use geometric morphometry to analyse the second lower molars of pigs associated with diverse periods, including the Longshan, Yueshi, and Shang and Zhou, at Dinggong, China. The results show that while there was a relatively consistent pig phenotype in this region from the Longshan to the Shang and Zhou periods, the centroid sizes of pigs experienced a moderate decrease over time. A certain number of wild boars were harvested by humans, but their proportions declined chronologically along with the gradually intensification of pig management. Apart from household refuse, fodders similar to the staple plants for humans were provisioned to those managed pigs, suggesting a close relationship between humans and pigs. In spite of more time and energy required for managing pigs, human societies could have benefited from this investment with a better secured meat supply and more ceremonial materials, which helped strengthen the human–pig bond from the Neolithic period to today.