BEIJING — Pork prices in China edged down last week, official data showed.

From May 23 to 27, the average pork price tracked by the Ministry of Agriculture and Rural Affairs was 21 yuan (about $3.15) per kg, down 0.3 percent week-on-week. The price was 9 percent lower than a year ago.

China has introduced a three-level early-warning system to raise the alarm for excessive ups and downs in hog prices.

Livestock farms and households are advised to make reasonable decisions for production and operation to maintain the stability of hog production capacity.