Table 4. Descriptive statistics for oxidative markers measured in brain tissue of lactating and non-reproductive mice selected for high and low food intake.

Variables	NH	RH	NL	RL	Line	Reproductive status	n
PC	0.31a,b ± 0.02	0.30a,b ± 0.04	0.40a ± 0.04	0.25b ± 0.01	F1,37 = 0.12, P = 0.780	F1,37 = 4.90, P = 0.032	40
SOD	17.05 ± 2.54	17.44 ± 1.95	13.51 ± 1.21	15.50 ± 2.34	F1,36 = 1.83, P = 0.190	F1,36 = 0.40, P = 0.550	39
CAT	0.23a ± 0.02	0.41b ± 0.06	0.23a ± 0.02	0.36b ± 0.04	F1,37 = 0.001, P = 0.950	F1,37 = 10.9, P = 0.002	40
GPx	40.90 ± 12.20	52.30 ± 11.60	24.10 ± 4.75	51.40 ± 12.20	F1,32 = 0.62, P = 0.460	F1,32 = 2.70, P = 0.110	35

Measurements of various oxidative stress markers in brain tissue of reproductive (R) and non-reproductive (N) mice of selection lines for high (H) or low (L) food intakes. Values shown are mean ± SEM. Results of two-way ANOVAs are shown with line and reproductive status as fixed factors. No significant interactions between line and reproductive status were found in the models and these were therefore removed before final analysis. NH: Non-reproducing high food intake mice; RH: Reproducing high food intake mice; NL: Non-reproducing low food intake mice; RL: Reproducing low food intake mice. PC: Protein carbonyls; SOD: Superoxide dismutase; CAT: Catalase; GPx: Glutathione peroxidase. Different letters indicate significant differences between groups (post-hoc Tukey tests, p < 0.05).