The oestrous cycle

What is the oestrous cycle?

It is a 21-day cycle which is marked by the recurring appearance of oestrusAlso known as heat, is the physiological and behavioral phenomena which precedes and accompanies ovulation in female mammals. or heatAlso “oestrus”. Physiological and behavioural phenomena that precedes and accompanies ovulation in female mammals.. This is when ovulationExpulsion of an ovum from the ovary in female animals. occurs.

When does sexual activity start?
How long does it take for heifers and cows to complete a full cycle?

How do we know the cow is at heat?

 

 

 

 

 

 

 

 

 

Typical signs of heatAlso “oestrus”. Physiological and behavioural phenomena that precedes and accompanies ovulation in female mammals.: 

  

What happens after heat?

Heat and ovulation and luteal phase

After heatAlso “oestrus”. Physiological and behavioural phenomena that precedes and accompanies ovulation in female mammals. and ovulationExpulsion of an ovum from the ovary in female animals., the cycle continues with the formation of the corpus luteumOrganelle formed after ovulation of a dominant follicle. Its thick wall is formed from progesterone-secreting cells. It is the sign of the cyclical activity being maintained in the event of pregnancy., which corresponds with the luteal phase.

 

 

The corpus luteumOrganelle formed after ovulation of a dominant follicle. Its thick wall is formed from progesterone-secreting cells. It is the sign of the cyclical activity being maintained in the event of pregnancy. evolves in three stages:

Growth period: 4 to 6 days during which it remains insensitive to prostaglandinSubstance derived from a fatty acid, present in many body tissues and involved in numerous biological processes (contraction of the uterus, inflammation, blood clotting, etc.). action. 

Period where activity is maintained: 10 to 12 days. 

LuteolysisRapid degeneration of the corpus luteum in the late luteal phase under the action of prostaglandins F2alpha secreted by the uterus when fertilisation does not occur. period: finally, if fertilisationUnion of a male gamete (sperm) with a female gamete (ovum) to give an egg, or zygote. has not occurred, there is a period of luteolysisRapid degeneration of the corpus luteum in the late luteal phase under the action of prostaglandins F2alpha secreted by the uterus when fertilisation does not occur. which lasts for around 24 hours.

            

  

  

  

   

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