Table 1 Reproductive performance of lactating female mice selected high (H) and low (L) food intake.

From: Oxidative costs of reproduction in mouse strains selected for different levels of food intake and which differ in reproductive performance

Variables

H mice(N = 22)

L mice (N = 15)

Outcomes of T-test

Body mass (g) measured prior to reproduction

24.9 ± 0.4

25.2 ± 0.6

t1,26 = −0.32, P = 0.75

Body mass (g), d15 of lactation

32.8 ± 0.7

29.9 ± 0.8

t 1,30 = 2.77, P = 0.01

MEI (kJ d−1, d12-d14 of lactation

210.9 ± 7.6

129.4 ± 6.5

t 1,34 = 8.12, P < 0.001

DEE (kJ d−1), d15-d17 of lactation

90.4.4 ± 2.

72.2 ± 2.1

t 1,34 = 5.05, P < 0.001

MEO (kJ d−1)

120.6 ± 6.7

57.1 ± 6.7

t 1,34 = 7.19, P < 0.001

Litter size at weaning (d18)

7.1 ± 0.3

5.7 ± 0.4

t 1,26 = 2.48, P = 0.02

Litter mass (g) at weaning

70.9 ± 2.6

45.2 ± 2.8

t 1,32 = 6.65, P < 0.001

Pup mass (g) at weaning

10.1 ± 0.2

8.1 ± 0.3

t 1, 26 = 6.42, P < 0.001

  1. Mean ± SEM for variables measured in H and L mice prior and during lactation. Results for independent t-test are shown. MEI: Metabolisable energy intake; DEE: Daily energy expenditure; MEO: Milk energy output. Values shown are mean ± SEM.
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