Key TakeawaysCal-Maine Foods shares gained Wednesday, a day after the company reported better-than-expected results on higher egg prices and holiday season demand.The biggest U.S. egg producer also benefited from the acquisition of the production assets of ISE America.Cal-Maine said egg prices have continued to rise as recent outbreaks of Bird Flu in the U.S. limited supply. Cal-Maine Foods (CALM) shares gained Wednesday, a day after the biggest U.S. egg producer beat profit and sales estimates on higher pr ...