NEW YORK ( TheStreet) -- CHANGE IN RATINGS Buffalo Wild Wings ( BWLD) was upgraded at Miller Tabak to buy from hold. $117 price target. Company is seeing lower wing costs and continued comp sales growth, Miller Tabak said. Greenbrier Companies ( GBX) was downgraded to hold at TheStreet Ratings. Mead Johnson ( MJN) was downgraded at Morgan Stanley to equal-weight. $76 price target. Pricing headwinds could limit upside potential, Morgan Stanley said. MILL) was downgraded to sell at TheStreet Ratings. Zoetis ( ZTS) was upgraded at Bank of America/Merrill Lynch. $35 price target. Company can gain market share and boost returns, BofA/Merrill said.