DENVER – A bison boomlet is under way as Americans look for an Atkins diet-friendly and mad cow-proof alternative to beef. Although the bison industry is just a baby when it comes to U.S. meat production, there are signs of heightened interest as producers recover from a mid-1990s slump brought on by overproduction. "People see it more, probably sample it more and they like it," said Roy Rozell, who manages a bison ranch in Colorado. A good indicator of the bison industry's turnaround is Ted's Montana Grill, a national chain of 18 restaurants co-founded by Ted Turner, media mogul and...