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=== Cyclic Changes in the  Uterus ===
 
=== Cyclic Changes in the  Uterus ===
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* Oestrus:
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** Uterus is congested
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** Endometrium contains oedematous fluid, which causes its surface to glisten.
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** Muscularis is contractile, so when palpated per rectum, the uterus feels turgid and the horns feel erect and coiled.
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*** Tonicity is present the day before and the day after oestrus, but is at its maximum during heat.
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** Marked increase in vascularity
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* 24-48 hours postoestrus:
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** Uterine caruncles show petechial haemorrhage.  This gives rise to the discharge of blood from the vagina.
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*** In heifers, there is also often perimetral subserous petechiae.
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* Dioestrus:
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** Endometrium is covered with scanty secretion from the uterine glands.
    
=== Cyclic Changes in the Ovaries ===
 
=== Cyclic Changes in the Ovaries ===
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