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== Endocrinology of Seasonality ==
 
== Endocrinology of Seasonality ==
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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. * Concentrations of LH are higher during the breeding season than during the non-breeding season.
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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.  
** During the breeding season the pituitary gland is more sensitive to and releases more LH in response to Gonadotrophin Releasing Hormone (GnRH) release from the hypothalamus.
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* 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 hypothalamus.
    
== Oestrous Behaviour ==
 
== Oestrous Behaviour ==
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