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* Uterus enlarges slightly
 
* Uterus enlarges slightly
 
* [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology#Endometrium|Endometrium]] becomes congested and oedematous, glands show secretory activity.
 
* [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology#Endometrium|Endometrium]] becomes congested and oedematous, glands show secretory activity.
* [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- Anatomy & Physiology#Vagina_2|Vaginal]] mucous becomes hyperaemic.  
+
* [[Vagina and Vestibule - Anatomy & Physiology#Vagina_2|Vaginal]] mucous becomes hyperaemic.  
** Increase in cell numbers in the [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- Anatomy & Physiology#Vagina_2|vaginal]] epithelium.
+
** Increase in cell numbers in the [[Vagina and Vestibule - Anatomy & Physiology#Vagina_2|vaginal]] epithelium.
 
** Superficial layers become cornified.
 
** Superficial layers become cornified.
 
* The '''[[Female_Reproductive_Tract_-Oestrous_Cycle_- Anatomy & Physiology#Bitch|bitch]]''' shows external evidence:
 
* The '''[[Female_Reproductive_Tract_-Oestrous_Cycle_- Anatomy & Physiology#Bitch|bitch]]''' shows external evidence:
** [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- Anatomy & Physiology#Vulva|Vulval]] oedema
+
** [[Vagina and Vestibule - Anatomy & Physiology#Vulva|Vulval]] oedema
 
** Hyperaemia
 
** Hyperaemia
** Sanguinous [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- Anatomy & Physiology#Vulva|vulval]] discharge
+
** Sanguinous vulval discharge
    
=== Oestrus ===
 
=== Oestrus ===
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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.
* [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology#Histology|Uterine]], [[Female_Reproductive_Tract_-The_Cervix_- Anatomy & Physiology#Histology|cervical]] and [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- Anatomy & Physiology#Vagina_2|vaginal glands]] secrete increased amounts of mucus.
+
* [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology#Histology|Uterine]], [[Female_Reproductive_Tract_-The_Cervix_- Anatomy & Physiology#Histology|cervical]] and [[Vagina and Vestibule - Anatomy & Physiology#Vagina_2|vaginal glands]] secrete increased amounts of mucus.
 
* Vaginal epithelium and [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology#Endometrium|uterine endometrium]] becomes hyperaemic and congested.
 
* Vaginal epithelium and [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology#Endometrium|uterine endometrium]] becomes hyperaemic and congested.
 
* [[Female_Reproductive_Tract_-The_Cervix_- Anatomy & Physiology|Cervix]] is relaxed
 
* [[Female_Reproductive_Tract_-The_Cervix_- Anatomy & Physiology|Cervix]] is relaxed
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* Granulosa cells of the [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulated]] [[The_Ovary_-_Follicles_- Anatomy & Physiology|follicles]] give rise to lutein cells, which are responsible for the [[Corpus Luteum Formation - Anatomy & Physiology|formation of the corpus luteum]] (luteinisation).
 
* Granulosa cells of the [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulated]] [[The_Ovary_-_Follicles_- Anatomy & Physiology|follicles]] give rise to lutein cells, which are responsible for the [[Corpus Luteum Formation - Anatomy & Physiology|formation of the corpus luteum]] (luteinisation).
 
* Progesterone secretion is detectable soon after [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulation]], with significant quantities produced in 2-5 days.  This marks a transition from oestrogen to progesterone dominance.
 
* Progesterone secretion is detectable soon after [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulation]], with significant quantities produced in 2-5 days.  This marks a transition from oestrogen to progesterone dominance.
* Reduction in secretion from [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology#Histology|uterine]], [[Female_Reproductive_Tract_-The_Cervix_- Anatomy & Physiology#Histology|cervical]] and [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- Anatomy & Physiology#Vagina_2|vaginal glands]].
+
* Reduction in secretion from [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology#Histology|uterine]], [[Female_Reproductive_Tract_-The_Cervix_- Anatomy & Physiology#Histology|cervical]] and [[Vagina and Vestibule - Anatomy & Physiology#Vagina_2|vaginal glands]].
    
=== Dioestrus ===
 
=== Dioestrus ===
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* [[Female_Reproductive_Tract_-The_Cervix_- Anatomy & Physiology|Cervix]] becomes constricted
 
* [[Female_Reproductive_Tract_-The_Cervix_- Anatomy & Physiology|Cervix]] becomes constricted
 
* Secretions of the tract are scant and sticky.
 
* Secretions of the tract are scant and sticky.
* [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- Anatomy & Physiology#Vagina_2|Vaginal mucosa]] becomes pale.
+
* [[Vagina and Vestibule - Anatomy & Physiology#Vagina_2|Vaginal mucosa]] becomes pale.
 
* Ends with the [[Female_Reproductive_Tract_-The_Ovary_- Anatomy & Physiology#Corpus_Luteum_Regression|regression of the corpus luteum]] (luteolysis).
 
* Ends with the [[Female_Reproductive_Tract_-The_Ovary_- Anatomy & Physiology#Corpus_Luteum_Regression|regression of the corpus luteum]] (luteolysis).
  
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