Please don't be insulted if you are not among the group that I am addressing!
You can't just "drop" a herd of cattle into a pasture. They require much more care than that. They need to be checked, double-checked and re-checked. They need water, mineral, salt and perhaps supplemental feed depending on how many and what's in your pasture. They get sick and injured on occassion. They need vaccinations, wormings and general care.
If you already knew all that, I apologize, but it seems that many on this list come looking for help after "dropping" some cattle in a field and then discover the hard way that there is more to it than that.
Whether or not you can make money depends on the price of feed (what will they eat in the wintertime?), and many other factors. You need to make a plan, investigate the costs and returns. Then you can tell if you will make money (maybe). Expect the unexpected.