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* Plasma levels of oestradiol 17β very considerably from one month to another but there does not seem to be any association between the level of this hormone and breeding activity.  
 
* Plasma levels of oestradiol 17β very considerably from one month to another but there does not seem to be any association between the level of this hormone and breeding activity.  
 
* Concentrations of LH are higher during the breeding season than during the non-breeding season.
 
* Concentrations of LH are higher during the breeding season than during the non-breeding season.
** During the breeding season the [[Endocrine_System_-_Pituitary_Gland_-_Anatomy_%26_Physiology|pituitary gland]] is more sensitive to and releases more LH in response to Gonadotrophin Releasing Hormone (GnRH) release from the [[Endocrine_System_-_Hypothalamus_-_Anatomy_%26_Physiology|hypothalamus]].
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** During the breeding season the [[Pituitary_Gland_-_Anatomy_%26_Physiology|pituitary gland]] is more sensitive to and releases more LH in response to Gonadotrophin Releasing Hormone (GnRH) release from the [[Hypothalamus_-_Anatomy_%26_Physiology|hypothalamus]].
    
=== Oestrous Behaviour ===
 
=== Oestrous Behaviour ===

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