S1 Table. Basic information about subject individuals in E1 group.

The age of each female in 2015 was estimated based on immigration date and several morphological cues, while the age of males was estimated mostly based on their birth date with morphological cues. The immigration dates of Yk, Hs, Jk, and Sl were the year and month when they were identified. The infant age in April 2015 is expressed in months. Ovulation cycles: ovulation detected menstrual cycles, (anovulation): anovulatory cycle. MSP: The number of maximal swelling phases (MSPs) defined for the female. †, ‡: infant births within 2 weeks.