Do 301 redirect old domains get dropped?

[petec2]

I have a main domain weddingpages.co.uk and additional domains wedding-pages.co.uk and wedding-pages.com if i 301 redirect the secondary domains will those domains drop out of the search engines altogether eventually to be replaced by the one main domain?

The secondary uk domain is higher in the serps on some se's like yahoo,(but main domain occupies best position in google), in yahoo will i get the benefit of any existing rank transferred over to the main domain and would this eventually take over the old domains existing higher position or perhaps appear even higher with the 301 adding extra 'points' to the main domain?
Or am i better off leaving as it is with the domains found at 3 varying locations in the search results?

[bhartzer]

if i 301 redirect the secondary domains will those domains drop out of the search engines altogether eventually to be replaced by the one main domain?

Yes. By setting up the 301 Permanent Redirect, you're telling everyone (search engines and humans) that those domains are no longer found at that URL--they're now at the domain you're redirecting them to(the main one).

Even though the other domains are higher in the SERPs now, since they're redirected their links and rankings should be "forwarded" to the main domain.