China's hog inventory hit 472.48 million head in September, increasing 1.3 percent from August and 1.5 percent from 2011, according to statistics published by the Chinese Ministry of Agriculture.

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This number included 50.65 million fertile sows, a 2.1 percent increase from August and a 4.7 percent increase from 2011. From January to September, the stocks of all pigs and sows have been increasing steadily, according to the ministry. September saw the highest increase, creating a four-year high.