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* The pineal gland controls reproductive cyclicity in seasonal breeders (sheep, goats, horses and cats) by the secretion of melatonin as the daylight hours are reduced.  For more information on this mechanism, click [[Female_Reproductive_Tract_-Seasonality_of_Reproduction_-_Anatomy_%26_Physiology#Mechanism_of_seasonality|here]]
 
* The pineal gland controls reproductive cyclicity in seasonal breeders (sheep, goats, horses and cats) by the secretion of melatonin as the daylight hours are reduced.  For more information on this mechanism, click [[Female_Reproductive_Tract_-Seasonality_of_Reproduction_-_Anatomy_%26_Physiology#Mechanism_of_seasonality|here]]
 
* Melatonin can be used successfully to modify seasonal activity in the species mentioned, most practically the ewe.
 
* Melatonin can be used successfully to modify seasonal activity in the species mentioned, most practically the ewe.
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== Immunization ==
    
= Manipulation of the Oestrous Cycle in Various Species =
 
= Manipulation of the Oestrous Cycle in Various Species =
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