Fellow future bovine practitioner here! It certainly depends on what kind of cattle you desire to work with (i.e., beef, dairy, both). Personally, I'm a beef guy. I will be working in the southeastern United States following graduation at a rural mixed practice; we're pretty much the only option for cattle vets in our area. I've been working there as a tech/assistant for 10 years, though, so I didn't have to work very hard to find a bovine-centric job
Although our location has plenty of cattle to keep me content, I will undoubtedly have to supplement my income with small animal work. While it's not my absolute favorite activity, I do find pleasure in working with dogs and cats. I will always consider myself a cow doctor first and foremost though. The only vets in our area that make a living from cow work alone are the repro pros, but I'm not interested in that. I prefer to work with herds and individual sick/injured animals. I'm one of those weirdos that loves to go pull a calf in the middle of the night.
It's not a possibility for me, but to only practice beef medicine I would need to move to the western plains. For those who want to work with dairy cows, the midwest is their best bet. It can be tough for us folks who would prefer to practice food animal medicine exclusively. Today, less than 1% of Americans are professional farmers, and that drastically limits the geographical area in which we can make a living solely off farm work.