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Oestrous Cycle Pharmacological Manipulation - Anatomy & Physiology (view source)
Revision as of 13:13, 12 September 2008
, 13:13, 12 September 2008→Physiological: The Ram Effect
=== Physiological: The Ram Effect ===
=== Physiological: The Ram Effect ===
* Ram stimulate gonadotrophin secretion form the anterior pituitary gland and subsequent ovulation in anoestrus ewes through chemosensory cues.
* Isolate ewes for 3-4 weeks before introducing the ram.
* Only effective at certain times of the year - just before commencement of the natural breeding season. This method is not effective for ewes in deep anoestrus.
* The majority of ewes ovulate within 6 days of introducing the ram.
* Priming with progesterone (intravaginal sponge or intramuscular injection) prior to the introduction of the ram will increase the percentage of ewes showing oestrus behaviour.
* Cheap and easy, but not very effective as a sole method.
=== Pharmacological: Gonadotrophins ===
=== Pharmacological: Gonadotrophins ===