The reason our ag teachers don't allow us to just leave them free-choice to the feed is that then we can't monitor how much feed they are actually consuming. At this point, he isn't even making it to a "wet-bunck" with the four or so pounds I'm feeding him each feeding. He'll leave about a half about a half a scoop's worth of feed in the feeder and either lay down or walk to the back gate to be let out.
he's penned up by himself during the day and at night they're turned out for exercise.
OK, now if he's penned during the day and let out at night...surely you can leave feed during the day? To be honest, your ag teachers need to put their thinking caps on. First, each student should know what his/her steer is eating in pounds per day, not scoops. If you're dealing with pounds of grain then you know percentage of body weight...etc. Second, if you know what he gets in pounds per day, you weigh the feed before you put it in his bucket, weigh what's left at the next feeding, same for the next time - and you know exactly how much feed
in pounds your steer is eating per 24 hour period. Simple math.
Free-choice doesn't mean you have to leave a 50lb bag poured in the feeder. Measure out your 4 pounds for the morning feeding, put it in his bucket, come back at the evening feeding and weigh what's left. Technically he should be eating at least 2% of his body weight
in something. Grain and/or hay. So if he's not eating his grain you need to find out what and where he's getting the rest of his feed. How much hay are you feeding and are you giving him as much as he wants/will eat?
Not trying to put you down or anything like that. Just that your ag teachers' logic doesn't make sense to me right now and I'm trying to figure it out. ;-) So far I'm not overly impressed with them.
The next question - how closely do you have to adhere to the rules and/or advice set by the ag teachers? (That was worded wrong, LOL!) If it were me...and the steer was obviously healthy and/or you had him checked out OK, I'd go ahead and do whatever I had to do to get him eating - within the rules. If that means a vitamin B12 complex twice a day, fine. If it means changing the feed, fine. If that means I leave feed out all the time and keep him penned 24/7 except for walks, fine.
You may have to experiment a little to find out what it's going to take to get him eating again.
Or...just thought of this; sometimes they DO eat better with a companion. It's competition. I almost always keep a minimum of 2 'bovines' per pen except for special instances. Might experiment that way too. Even a small calf just to keep him company.
Oh, and the obvious - feeders, buckets, feed all clean?