Blend tree like effect on one animation ?

I wanted to make a health bar , but its not a rectangle so I made alot of frames of the health bar going from full to empty and I wanted to make the animation progress as the health var changes , is there is a way to change the frames of animation depending on a parameter in mechanim ? like the effect of blend tree when you switch between animations depending on a value of a parameter , but I need this for only one animation.