Cal-Maine drops after co posts wider quarterly loss
** Shares of egg supplier Cal-Maine Foods CALM.O fall 6.5% to $64.1 premarket
** Co posts Q1 revenue of $539.6 mln, down from $922.6 mln a year ago
** CALM posts Q1 net loss of $58.62 mln vs profit of $199.3 mln a year ago
** Co says conventional shell egg prices fell sharply during Q1 due to industry supply imbalance after flock repopulation
** As of last close, stock down 13.9% YTD