Twenty-four P rats and 24 NP rats were conditioned to consume 10% w/v
alcohol in daily 0.5-h limited access periods using a modified version
of Samson's sucrose fading procedure. Both P and NP rats demonstrated
a strikingly similar day-to-day pattern of alcohol intakes. For the m
ost parr, P rats drank more than NP rats, but by the middle of the fou
rth month of drinking, P and NP rats were drinking equivalent amounts
of alcohol. Both P and NP rats consumed alcohol in amounts similar to
two outbred strains of rats (Wistar and Sprague-Dawley) previously con
ditioned to drink alcohol in this laboratory. (C) 1998 Elsevier Scienc
e Inc.