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Oestrous Cycle Pharmacological Manipulation - Anatomy & Physiology (view source)

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=== Pharmacological: Melatonin ===

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* Used comercially to advance the onset of the breeding season.

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* The breeding season can be advanced by 2-3 months with good fertility.

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* Administered as an implant containing 18mg of melatonin, which is inserted subcutaneously at the base of the ear.

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* Ewes should be completely isolated from rams at least 7 days before insertion of the implant.

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* They should remain separated for at least 30 days, and no more than 40 days.

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* Rams should then be reintroduced.

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* Peak mating activity occurs 25-35 days later.

== Cow ==

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