KFC parent Yum Brands on Monday warned that sales in its key China division shrank more than expected in the fourth quarter, and it reiterated an earnings forecast that was below what Wall Street expected.

Yum , versus its earlier 4 percent forecasted decline. In a regulatory filing, it blamed "adverse publicity" from a Chinese government review of the country's poultry supply and the impact it had on KFC sales in China in the last two weeks of December.