My Son in Law purchased a few longhorn for my pasture. He was looking for a leaner, healthier steak. But leaner and healthier does not necessarily mean tastier. I have eaten lots of dairy steers, and dairy crosses. They also do not in any way compare to a good beef steer.
We much prefer hereford, angus, or a cross between the two. And we prefer them fresh off of clipped pasture in the fall, with never a taste of grain.
