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. Author manuscript; available in PMC: 2014 Mar 1.
Published in final edited form as: Neurobiol Learn Mem. 2013 Jan 26;101:85–93. doi: 10.1016/j.nlm.2013.01.005

Table 1.

Mean (+/− SEM) number of pellet or milk reinforcers earned under a FR 1 schedule for each strain. This unconstrained consumption is also the number of responses during the thirty-minute session. Reinforcers earned was the mean number across the two FR 1 sessions of exposure for each subject. BALB/c mice earned significantly more milk than pellet reinforcers (* p < 0.02) and more milk reinforcers than C57BL/6 mice (# p < 0.04).

Strain
BALB/c C57BL/6 DBA/2
Pellet 144.8 (13.4) *# 166.4 (11.9) 134.4 (17.1)
Milk 240.7 (9.2) 155.9 (9.0) 175.0 (27.9)