I raise my own from birth. Takes about 18-20 months. I wean at 6-8 months then dry lot two animals together for the next year. But I keep my 2 culls so my weight gain is off. Then I sell a heavy feeder and kill one. If using better calves might knock a couple months off. Feeders in my area are high right now 500-600 pound feeder steers(males that have been castrated) are running 1.60-1.80 per pound.
No fence. I used cattle panels and t post to build my dry lot. But had it attached to my barn for shade and shelter. In total my pin is 68x32. 20x32 is under roof with 3 sides a partial front wall to help with wind. Build on a hill with good drainage. Pick panels up off ground 6" or so manure and water can drain away at bottom of slope. Will need straw for bedding and to help cut mud. I also added a 2x6 on top of my panels and a hot strand of barbed wire on top of that to stop jumping.
Will need 1-1 1/2 4x5 bales of hay per month per calf. $40 a bale for good stuff. I feed 5lbs of a 2/3 soyhull and 1/3 corn gluten mix split into two feedings per day. Feed cost me $250 / ton picked up. A $30 bag of a high quality mineral goes a long way with one calf. Measure and mix with feed per bag directions.
My slaughter house charges around $200 per calf.
Ok now let me make a suggestion. Find a local farmer and buy a calf delivered to slaughter house. I have sold like this in past. I always figured out my cost and profit and priced a weight range and per pound for that range. You might have to give him some notice. Some times my slaughter house has ads hanging around that people have calves ready. And some are taking orders
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Good luck.