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Oestrous Cycle Pharmacological Manipulation - Anatomy & Physiology (view source)
Revision as of 10:05, 12 September 2008
, 10:05, 12 September 2008→Pharmacological: Progestogens
=== Pharmacological: Progestogens ===
=== Pharmacological: Progestogens ===
* Used alone or in conjuction with other hormones.
* Used to induce oestrus in the anoestrus ewe during the non-breeding season and for oestrus synchronization in cyclic ewes.
* Progestogens are now used more commonly than progesterone itself. These include:
** Fluorogestone acetate (FGA)
** Medroxyprogesterone acetate (MAP)
==== Intravaginal Sponges ====
==== Intravaginal Sponges ====
* The sponge is impregnated with progestogens and inserted into the vagina.
* Progestogen is absorbed in sufficient quantities to cause a negative feedback effect on pituitary function.
* When used outside of the normal breeding season, eCG is administered at the end of the progestogen priming period.
* Fertility may be reduced at first mating after synchronized oestrus. This may be due to poor absorbtion of progestogen from the sponge. It may also be the effect of abnormal hormone levels on sperm survival.
=== Pharmacological: Prostaglandins ===
=== Pharmacological: Prostaglandins ===