* In the bitch and queen, corpora lutea are unresponsive to exogenous prostaglandins unless they are given repeated doses.
* In the bitch and queen, corpora lutea are unresponsive to exogenous prostaglandins unless they are given repeated doses.
* Prostaglandins will cause abortion, do not use in animals that might be pregnant!
* Prostaglandins will cause abortion, do not use in animals that might be pregnant!
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=== Melatonin ===
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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 [[here]]
= Manipulation of the Oestrous Cycle in Various Species =
= Manipulation of the Oestrous Cycle in Various Species =