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Oestrous Cycle Pharmacological Manipulation - Anatomy & Physiology (view source)
Revision as of 13:53, 12 September 2008
, 13:53, 12 September 2008→Sow
* Supress follicular maturation when fed daily at 15-20mg with no effect on the life span of corpora lutea.
* Supress follicular maturation when fed daily at 15-20mg with no effect on the life span of corpora lutea.
* Feed for 18 days to achieve synchronization of oestrus 5-7 days after withdrawal.
* Feed for 18 days to achieve synchronization of oestrus 5-7 days after withdrawal.
=== Pharmacological: Prostaglandins ===
* Theoretically gives reliable synchronization of oestrus in groups of gilts and sows.
* Enables ease of artificial insemination and batch farrowing.
* But, prostaglandins and their analogues are not luteolytic until day 11-12 of the oestrous cycle.
* Thus, an injection regime for groups of animals at random periods of the oestrous cycle is not possible.
* However, it is possible after injection of oestrogen (see below)
* Another indication for use of prostaglandins is to induce luteolysis of accessory corpora lutea after use of eCG or hCG at any stage of the oestrous cycle.
=== Pharmacological: Oestrogens ===
* Prolong the lifespan of corpora lutea
* Inject oestrogen on day 10-14 of the oestrus cycle.
* Then, prostaglandins can be injected after 5-20 days.
* Oestrus will occur 4-6 days later.
=== Pharmacological: Gonadotrophins ===
=== Pharmacological: Gonadotrophins ===