** Shares of egg producer Cal-Maine Foods CALM.O fall 4.24% to $86.50 in extended trade

** Company reports Q3 revenue of $1.42 bln, lower than analysts' estimates of $1.43 bln, according to data compiled by LSEG

** CALM to acquire Echo Lake Foods for about $258 mln

** Company says it is cooperating with a U.S. Department of Justice investigation into the high pricing of eggs and potential collusion among producers to inflate rates

** One of two brokerages rates the stock "buy" or higher, the other rates "hold"; their median PT is $102.50 - LSEG data

** As of last close, stock down 12% YTD

(Reporting by Anshuman Tripathy)

((Anshuman.Tripathy@thomsonreuters.com))