Tractor Supply Company (NASDAQ:TSCO) shares are trading lower after the company reported first-quarter earnings per share of $1.83, beating the analyst consensus of $1.71.  Quarterly revenues of $3.395 billion were in line with the estimates, rising 2.9% year over year.  Comparable store sales, which increased 1.1%, slowed compared to the prior year  (2.1% growth for the previous year’s first quarter). New store openings ...