The age, that is, the duration of the life of the mother at the point in time when her final offspring is born; the latest or oldest age at which a specific individual has given birth.
maternal age at first egg production
number of blastocysts implanted per litter
number of fetuses with external malformations to total number of live fetuses ratio +
number of fetuses with skeletal malformations to total number of fetuses ratio +
number of fetuses with visceral malformations to total number of fetuses ratio +