used to evaluate the relationship of factors and return to
estrus in 330 weaned sows are presented in Table 4. Sows
with a LL of 15–19 days had 3.5-times higher odds
(P < 0.05) of a return to estrus than sows with LL of 20–21
days. The return to estrus rate was not affected (P > 0.05)
by the number of weaned piglets or by the interaction
between LL and BCS loss. Nevertheless, return to estrus in
weaned sows was affected by the interaction between PO
and BCS loss during lactation. Loss of more than 0.5 point in
BCS resulted in higher odds (P < 0.05) of returning to
estrus in PO1 and PO2 but not in PO>2 sows.