Differences between Estrous and Menstrual Cycles

Created by Murtaghj 

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F-phase E

short

F-phase M

long

Ovulation E

at the beginning and end of cycle

Ovulation M

middle of cycle (14)

L-phase E

80% of cycle

L-phase M

50% of cycle

Fertile period E

24 hrs or less

Fertile period M

up to 6 days before ovulation

Endometrial Sloughing E

none

Endometrial Sloughing M

after luteolysis

Luteolysis E

uterine PGF2a

Luteolysis M

ovarian PGF2a

Sexual Rec. E

well defined

Sexual Rec. M

uniform through cycle

P4 fxn. and sexual rec. E

inhibits GnRH release
inhibits sex. rec.

P4 fxn. and sexual rec. M

inhibits GnRH release
dosn't influence sex. rec.

Menopause E

none

Menopause M

well characterized

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