Um.... are you intending to carbonate in those growlers? Because those are definitely not rated for pressure. You might be getting some apple-flavor bottle bombs.
Growlers are meant for the transport of already carbonated (or still) beverages. But if you've chipped the threads I'd say use them to make starters.
Primary: air and sadness =(
Kegged: air and sadness =(
Bottled: English Barleywine (brewed 9/26/09 -- bottled 5/5/10)
LET'S GO LA!
PLAY FOR GLORY, THE GLORY LA!