Oestrous cycle | Menstrual cycle |
Species with oestrous cycles, females are generally only sexually active during the estrus phase of their cycle | In contrast, females species with menstrual cycles can be sexually active at any time in their cycle even when they are not about to ovulate |
The oestrous cycle occurs in reptiles | The menstrual cycle occurs in mammals |
The oestrous cycle is determined by FSH hormone | The menstrual cycle is determined by LH hormone |
Oestrous cycles resorb the endometrium if conception does not occur during that cycle | Animals with menstrual cycles shed the endometrium through menstruation |
The oestrous cycle is the reproductive system in most mammals where reproductive hormones cause the cycles to start after puberty in sexually mature females | The menstrual cycle is the regular natural change that occurs in the female reproductive system that makes pregnancy possible |