animals Review Canid Reproductive Biology: Norm and Unique Aspects in Strategies and Mechanisms Jennifer B. Nagashima * and Nucharin Songsasen Center for Species Survival, Smithsonian Conservation Biology Institute, 1500 Remount Rd., Front Royal, VA 22630, USA;
[email protected] * Correspondence:
[email protected] Simple Summary: The family Canidae, composed of dog-like species such as wolves, foxes, and jackals, demonstrates a significant variety in reproductive biology. In general, female canids expe- rience very long periods of ovarian inactivity during the year; however, there are diverse patterns with regard to seasonality between species, as well as within an individual species depending on geographic region or housing status. Understanding of these differences is critical to the development of assisted reproductive technologies for canid conservation efforts. This review summarizes the current knowledge of canid reproduction, including reproductive cyclicity, seasonal breeding, male sperm traits, and recent developments in assisted reproductive technologies for canids. Abstract: The reproductive physiology of canids is unique compared to other mammalian species. Specifically, the reproductive cycle of female canids is characterized by extended periods of proestrus and estrus followed by obligatory diestrus and protracted ovarian inactivity (anestrus). Although canid reproduction follows this general pattern, studies have shown variations in reproductive biology among species and geographic regions. Understanding of these differences is critical to Citation: Nagashima, J.B.; the development of assisted reproductive technologies including estrus induction, gamete rescue, Songsasen, N. Canid Reproductive and embryo production techniques for canid conservation efforts. This review summarizes current Biology: Norm and Unique Aspects knowledge of canid reproduction, including estrus cyclicity, seasonality, and seminal traits, with in Strategies and Mechanisms.