Suiza Foods Corporation (NYSE: SZA), the nation's leading dairy processor and distributor, yesterday announced net sales totaled $1.5 billion for the quarter ended March 31, 2001, an increase of 5.8% over the first quarter of 2000. First quarter net income before non-recurring items increased 12.1% to $23.8 million from $21.3 million in the first quarter of 2000.