Differentiate Between Menstrual Cycle and Oestrus Cycle.

By BYJU'S Exam Prep

Updated on: September 25th, 2023

The menstrual cycle is the development of the female uterus where the endometrium sheds through blood whereas the oestrus cycle is the reabsorption of the endometrium if fertilization doesn’t happen. The growth of the female uterus is referred to as the menstrual cycle, and if fertilisation does not occur, the endometrium sheds blood. If fertilisation does not take place, the endometrial wall is reabsorbed during the oestrus cycle.

Difference Between Menstrual Cycle and Oestrus Cycle:

Menstrual cycle

Oestrus cycle

A constant breeder exhibits it.

In a seasonal breeder, it is observed.

Involves loss of blood.

Do not involve loss of blood.

Example: Humans and Apes

Example: Dog and cow.

Phases of Menstrual Cycle

The menstrual cycle is divided into four phases, namely:

  1. Menstrual phase: On the first day of the menstrual cycle, the uterine lining that has been primed for implantation begins to shed.
  2. The primary follicle begins maturing into a Graffian follicle during the follicular phase. The endometrium also begins to grow. The uterus begins to become ready for a subsequent pregnancy.
  3. Ovulatory phase: Also known as the mid-cycle phase, this is the time period between days 13 and 17 when ovulation occurs. The fertilisation period is determined by the conclusion of the follicular phase and the ovulation period.
  4. The post-ovulation stage known as the luteal phase is where the corpus luteum’s future is decided. If fertilisation takes place, pregnancy begins. The beginning of another cycle is signalled by the absence of fertilisation.

Phases of Oestrus Cycle

The oestrus cycle consists of four phases: pro-oestrus, oestrus, metoestrus, and dioestrus.


The follicular phase is when follicles begin to grow and release oestrogen. The endometrium, which lines the uterus, begins to form, and the vaginal epithelium multiplies.


It is often referred to as the hot period. The female is sexually open throughout this stage. In this stage, ovulation takes place. When a guy attracts a female, mating is imminent. Numerous symptoms, such as a reddening of the labia, may be present.


The burst follicle that forms the corpus luteum after ovulation does so during the luteal phase.


Progesterone hormone is produced by the corpus luteum, which also primes the uterus for implantation. The corpus luteum deteriorates without pregnancy. Instead of being shed here, the uterine lining is organised for the following


Differentiate Between Menstrual Cycle and Oestrus Cycle.

The Oestrus cycle is the reabsorption of endometrium if fertilisation is unsuccessful. The menstrual cycle is the growth of the female uterus during which the endometrium sheds through blood. The different phases of the oestrus cycle are pro-oestrus, oestrus, metoestrus, and dioestrus.

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