That is a pretty cool node tree!

So what's the problem, the brown "hair" isn't rendering? What does the curve settings panel look like? Is there a thickness to the geometry? I don't think the curves will show up in the render (or maybe they're there just very hard to see) unless extrude and/or bevel (in the screenie that I posted last comment) are greater than 0.

Also maybe try checking the Path Animation checkbox if it's not already checked on, I don't actually know if you need that or not but it's on in my thing ^_^;