Particles duplicated pile + alpha map problem

When I create fur with particles duplicators and alpha maps, the alpha don’t appears, in the place of transparency appears a white color how I can resolve it? Someone have a .blen example of how to make fur?

you’ll find everything you need here:
https://blenderartists.org/forum/viewtopic.php?t=41356

Thanks, but I found the solution. It has a error in the material setup.

The methond in this link don’t cast shadows.