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Oestrous Cycle Pharmacological Manipulation - Anatomy & Physiology (view source)
Revision as of 09:30, 12 September 2008
, 09:30, 12 September 2008→Pharmacological: Progestogens
===== Pharmacological: Progestogens =====
===== Pharmacological: Progestogens =====
* In competition horses, it is desirable to prevent the mare from coming into oestrus at inopportune times.
* In some cases it is desirable to synchronize a group of animals.
* A daily injection of progesterone (0.3mg/Kg) will prevent oestrus.
* The mare will return to oestrus 3-7 days after treatment ceases.
* Oral progestoges recommended include:
** Allytrenbolone
** Altrenogest
* These can be used in a number of ways:
1. To stimulate the onset of cyclic activity.
* Administer 0.044mg/Kg mixed in with the feed for 10 days and then stop.
* Give in the late transition period from anoestrus to cyclic activity when follicles are present.
* Better results when combined with increased lighting.
2. To suppress oestrus
* Feed for 15 days at 0.044mg/Kg
3. To suppress oestrus in mares with prolonged oestrus
4. To control the time of oestrus for effective use of the stallion.
* Feed for 15 days, then stop.
* Mare should come into oestrus 2-3 days later.
=== Inducing Ovulation ===
=== Inducing Ovulation ===