Beauty supplies retailer Sally Beauty Holdings Inc., which split off from Alberto-Culver Co. in November, said its fiscal second-quarter earnings fell by more than half, as interest expense surged and the company lost the right to sell certain L’Oreal products. Net income fell to $11 million, or 6 cents per share, from $31.2 million, or 8 cents per share, a year ago. Interest expense surged to $42.9 million from just $21,000 a year ago. Total sales grew 5 percent to $609.3 million from $581.1 million last year, as sales at stores open at least a year rose 3.8 percent. The company’s beauty systems group posted sales nearly flat with last year as about $20 million of lost L’Oreal product sales in February and March were partly offset by contributions from the Salon Success acquisition made in June 2006.