Research overview: oocyte quality and aging in felids

The quality and developmental competence of eggs decline with maternal age, contributing to reduced fertility in older female cats. This overview surveys research on how aging affects felid oocytes, including changes in maturation, fertilizability, and the capacity to support embryo development. It reviews evidence from the domestic cat model and from assisted-reproduction work with nondomestic species, where oocytes are recovered and matured in vitro. The review considers implications for harvesting and preserving eggs from aging individuals before quality falls and for interpreting why pregnancy rates decline with age. Understanding oocyte aging is relevant to both natural fertility decline and to the timing and success of assisted reproduction in conservation breeding programs.