Export toogle visibility from blender animation to animation in unity?

Hi, What is the method that working from this kind of task from blender, I exported the fbx with animations that appear and dissappear from blender to unity, and the animation(unity) only recognize the movements but not the change of visibility. alt text

This red drop(blood) in the center of the image below, need to dissappear once touch the ground, and reappear again at the top to fall one more time, this is blender. but in unity animations, that doesnt happen, It make me a transition where the drop goes up and then falls again but it never dissappear. alt text
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a thanks in advance guys.

I got it only making the scale to 0, and then to normal(1,1,1) when I need it, and in that way export the object in the fbx too!