Figure 1.
Figure 1.

Number fully formed (NFF), number born alive (NBA), and number weaned (NW) by parities (* indicates significant effect of parity on trait [P < 0.05]). Error bars denote SEM.

 


Figure 2.
Figure 2.

Fraction alive at birth estimated as number born alive (NBA) divided by number fully formed (NFF) across parities. Error bars denote SEM.

 


Figure 3.
Figure 3.

Average weaning weight per pup estimated as litter weaning weight (LWW) divided by number weaned (NW) across parities. Error bars denote SEM.

 


Figure 4.
Figure 4.

Lifetime number weaned (panel A), lifetime total weaning weight (panel B), and lifetime litter weaning weight/number weaned (panel C) per breeding pair for lines of mice selected for high (MH) or low heat loss (ML) or unselected control (MC). Error bars denote SEM.

 


Figure 5.
Figure 5.

Linear relationship between birth interval and parity for lines of mice selected for high (MH) or low (ML) heat loss and the unselected control (MC).

 


Figure 6.
Figure 6.

Probability of survival until next parity for breeding pairs of mice from lines selected for high (MH) or low (ML) heat loss and the unselected control (MC).

 


Figure 7.
Figure 7.

Probability of survival until next parity of breeding pairs of mice culled due to death or illness (DI), 2 consecutive letters with none born alive (0BA), 3 consecutive litters with none weaned (0W), a birth interval longer than 42 d (42BI), and average of the most recent 2 litters was less than half the average of the first 3 (LS).