Method 1: When the horse is not needed to run, kill it so that it will not eat grass. When you need a horse to run, get another one.

In the real world, no one but fools would use this method. Because it takes time to raise a horse again - I can't wait, I need grass - it may take more than raising an idle horse.

Method 2: When the horse is not needed to run, let it sleep without opening its eyes, moving, or barking.

Regardless of whether the horse is willing to sleep all the time, this method can only reduce the amount of grass the horse eats, because its heart is still beating and blood is still circulating, which also consumes energy. But fortunately, when you need a horse to run, you shouldn’t have to wait too long.

Method 3: Doesn’t it mean that heart beating and blood circulation also consume energy? Then stop doing these things, and save as much as you can.

It's indeed a good method, but you have to ask your veterinarian first to see if it can be done. However, with the current medical level, it is probably not possible.

In the computer world, the above methods are very common, and the control is far more sophisticated than these. Because computers were designed by humans, but horses were designed by God. However, through the example of horses, we can summarize the basic behavior of power management:

a. Close the temporarily unused parts in real time (can be called "transfer from working state to non-working state"). For example, when the phone is in your pocket, the screen does not need to be on.