Just like an annual cost/revenue type deal?
First of all it helps to have land and a trailer. I wouldn't go spend 80K on 40 acres to raise longhorns, but if you have the land do it for the tax credit.
Per head, you need 1.5 round bales of hay per winter at $30 or $35 a bale. We cut a deal with our neighbor who cuts hay. We rotate our cows to one of our 2 pastures and he cuts the hay off the other. We split the bales down the middle with him. So we get free hay and he cuts hay to sale half. Then you have to worm every year, but thats like $60 for the whole heard. We feed them cubes through the winter too, but only a sack or 2 a week maybe so another $300 total.
Revenue, we sale our unwanted cows by the pound. Running 20 head that usually ends up being 5 or 6 cows a year. They bring a little over $1/lbs. All in all it's enough to cover costs, but profitable is not the word to be used. We just like them, so it's worth it to us. If we were into trying to make money we'd have angus of braford cows with an angus bull.
What's a bull run?
It all depends, but you pay for what you get.
What do you sell that bull for down the road?
Rarely is someone going to have to have your bull. For the 11 bulls I listed there are 1000 more for sale all of the country at any given time.
Every two or 3 years, we put a new bull on our cows to insert new genetics, and our old bull is one of the 5 or 6 that gets hauled off to the sale where they bring a little over $1/lbs.