I would try first grow him accustomed to the bucket being around. Try playing the 'friendly game' and rubbing the bucket all over him. Then give him a treat, then bring your hand closer to the bucket, and when he moves his nose closer to the bucket give him another one and then put the other treats in the bucket. Try doing this a few times and he should grow used to having the bucket their and he'll learn that the bucket is a source of food and treats.
the bacteria builds up in the bucket and the horse may get sick
yes. a hoarse can eat a human but its highly unlikely and that has never been done. if you train it to, then yes.
Its not a horse its a train
You should know this but anyway,you put the food in the bucket and feed it to the horse.
8.5 kg
The same amount as any other horse of their size, really it depends on the size that they are and their needs, like if you were using them as a working horse then probably a 20l bucket twice a day would be suffice.
Yu train a Morgan horse like any other horse
To train your horse you have to press the little plus sign beside the bar that you'd like to train them in.
Just do lots of practise.
Train it.
by grain
no.