Aslam says retailers have been seeking price concessions and bidding different private label dairy suppliers against each other. As a result, Dean Foods has been forced to lower its prices in order to retain its share.

Related food stocks have also edged lower in midday trading.

ConAgra Foods ( CAG) is down 0.2% to $23.10. American Dairy ( ADY) has dipped 0.6% to $23.60. Lifeway Foods ( LWAY) has edged lower to $11.60, down 0.9%.

-- Reported by Andrea Tse in New York

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