Litter characteristics for lactation treatments

This contains all the data to assess how the lactation treatments (treated with GCs or Controls) impacted litter size at the first nest entry ("Nest1") or second nest entry ("Nest 2"), the proportion of the litter surviving from the first to second nest entry, and the litter sex ratio at the first and second nest entry. These analyses are presented in the main text of this manuscript. These data for litter sizes at first nest entry and Julian birth date are also used to generate the standardized litter size and Julian birth date scores for the other data files for lactation treatments.