The Hartford announced yesterday that its first-quarter profit fell 5.7 percent as results deteriorated in its property and casualty sector, which the company had focused on recently at the expense of life units. Net income dropped to $467 million, or $1.08 a share, from $495 million, or $1.03, a year earlier when there was more stock outstanding. The Hartford’s operating earnings also slipped 11 percent in commercial insurance to $234 million and 26 percent at personal insurance to $75 million. Travelers and Chubb also reported substantial downturns this quarter. According to the statement, results were helped in the year-earlier period by a $32 million benefit tied to workers’ compensation coverage in New York State.