Domestic pig breeds at risk of dying out
Farmer Zhang Qiang considers his pigs not just livestock, but national treasures.
He is among a handful of Chinese breeders who still specialize in native species - in his case, Wulian black pigs. Most others have switched to imported breeds.
"Almost all pork on the market in China is from species that originated overseas," said 41-year-old Zhang, who has two farms in Shandong province's Wulian county.
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