Scientifically, blood is the essence of animals; feeding falcons with meat drenched in blood can help them recover their physical stamina and energy reserves more quickly.
But why use lean meat instead of fresh prey? There are reasons for that too.
The amount of lean meat is something we've planned before going hunting; the extra part is just dipped in blood. If we let Little White feast on fresh meat until full, the intake would far exceed the standard, causing it to get a big throat crop, which is not conducive to continued training tomorrow.
The Eagle Hunter, also known as the Eagle Handler, balances the falcon's intake as food handling and feeding are often decisive. If it eats too little, the falcon lacks the strength to capture prey and can barely fly after a few attempts, making ongoing hunting troublesome.