HELP!! Mouse sperm : need info

[di Clemente]

I'd like to know a way to collect mouse sperm : 
         - outside a female
         - if possible without killing the male !!
It's not a joke, we need to test the sperm quality of our transgenic mice
because we don't know if our males are not fertile because their sperm is
not "OK" or they are impotent !

Thanks in advance for any helps or suggestions.

Nathalie

-- 
Nathalie di Clemente - 
e-mail : clemente at wotan.ens.fr
Ecole Normale Superieure (paris)