help!!!mice question!

R

hi guys,
does anybody knows if following of generation of transgenic mice (and i know are trangenic) i can use them immediately without doing characterisation?can i just do testm such as PCR and/or southern blot from biopsis and then if positive use them?what is exaclty does anybody knows if following of
generation of transgenic mice (and i know are transgenic) i can use them
immediately without doing characterisation i just do test such as PCR
and/or southern blot from biopsy and then if positive use them? what is exactly
the characterisation for???can i skip it??

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