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* The onset and end of oestrus are the only stages of the oetrous cycle that can be accurately measured.  They are therefore used to determine cycle length.
 
* The onset and end of oestrus are the only stages of the oetrous cycle that can be accurately measured.  They are therefore used to determine cycle length.
 
* Female seeks out the male and 'stands' to be mounted.
 
* Female seeks out the male and 'stands' to be mounted.
* Uterine, cervical and [[Female_Reproductive_Tract_-The_Vagina/Vestibule_-_Anatomy_%26_Physiology#Vagina_2|vaginal glands]] secrete increased amounts of mucus.
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* [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology#Histology|Uterine]], cervical and [[Female_Reproductive_Tract_-The_Vagina/Vestibule_-_Anatomy_%26_Physiology#Vagina_2|vaginal glands]] secrete increased amounts of mucus.
 
* Vaginal epithelium and [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology#Endometrium|uterine endometrium]] becomes hyperaemic and congested.
 
* Vaginal epithelium and [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology#Endometrium|uterine endometrium]] becomes hyperaemic and congested.
 
* Cervix is relaxed
 
* Cervix is relaxed
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