Domino’s Pizza Inc., the second- largest U.S. pizza chain, fell the most in almost two years after reporting first-quarter sales and profit that trailed analysts’ estimates. Net income declined 23 percent to $20.7 million, or 35 cents per share, from $27.1 million, or 43 cents, a year earlier. Per-share earnings, excluding some costs, were 47 cents, less than the 50 cents estimated by analysts.