Okay, I will weigh in on this subject. Cut the bull asap., there is no real good reason to keep a young bull that will start to feel his cheerios and wind up going through a fence or get in with the "80 yr old" (ha ha) bull next door and his girls and UH OH, you are in deep ***** with the neighbor just for starters. Any "beef" type calf with jersey influence will be SEVERELEY discounted at a stockyard as the fineness of the jersey shows through and these buyers are experienced at picking it out. Now, that said; jersey beef is one of the best, most tender, and well marbled beef there is. They mature and keep the tenderness long past the normal butchering age of 20-24 months. I have only eaten jersey beef for nearly 20 years and it is very tender and flavorful. Use this to your advantage if you are going to raise them through the winter, finish them on grass nest year and advertise and sell them on craigslist. Don't know about ohio, but here in Va there are a small number of people that like jersey beef and you would probably do better selling them private.
On that note, the feeder market is tanking and prices have fallen. Dairy steers here are bringing .60 to .80 lb. Jerseys on the low side, holsteins in the 70-80 cent range. Most any size. So at 600 lbs the jersey is only worth 360. Not much of a return. Eat him yourself or find someone who wants a jersey for beef and get your money back if you're lucky.
Winter hay needs. Here we figure 20 head per 5x5 round bale per day so a round bale will last 3 head of yearling cattle approx. 7-10 days depending on the weather. We get some cold weather here in the Shenandoah valley in the winter but not as cold as Ohio. And you will probably get more snow and it will come sooner and last longer than here. Consider also, jerseys do NOT get the longer hair coat of a "beef" animal, nor do they have the fat cover on them so will need more energy to stay warm so will eat more; meaning more corn/feed than most beef breeds. I would say figure the long end: 5 months hay 4 rolls per month minimum = 20 to 25 rolls for all three. There is nothing worse than not enough hay and can't find any to buy and spring is late getting here and cold and the grass just isn't growing much...
Hauling water is the pits, but REALLY THE PITS in the winter. you might want to butcher one ( or two) and use the money from the other to put in a water line next spring, out towards the pasture area where you can run a hose in the summer at least.
Do this once or twice and look around. Go to a stockyard if close to you and just watch. See what animals are bringing, get a feel for what's around, what's available, and what is in demand. I love belted galloways, had several but they are definitely a niche market. They are a double hair coat breed so do not get as much fat as some like angus, and I found them to be very docile. Just realize that you will take a shellacking if you take them to the stockyards to sell. NOT trying to discourage you, just do some homework and know what you can reasonably expect in return for your investment.
Most beef calves stay on their mothers for 7-10 months. If she calves, then you breed her back in 60-90 days, she will calve again in approx 12 months, (they carry for 9 months m/l) so the calf can stay with her for up to 10 months, then get taken off so she gets 2 months rest before starting a new calving/lactation again. No point in taking it off too soon then putting expensive feed into it when it can grow on mamma and eating grass etc.
Brewers grain from a brewery is a good feed but must be mixed into a balanced ration. Most breweries sell it buy truckload ( I mean big truckload not a pickup) and it has to be fed in a certain percentage, not as the only grain. It is honestly hardly worth it for only a couple of animals, and not something a newby should start out with. Get some experience with animals before you try to get too creative or you could lose one or more just from not realizing what's what. This is not trying to discourage you. Get your feet wet before you try to jump off the diving board if you've never taken a swim before.
Hope this is of some help.