4,503
edits
Changes
Oestrus Behaviour - Anatomy & Physiology (view source)
Revision as of 11:32, 1 August 2008
, 11:32, 1 August 2008→Cow
* Average oestrus detection rates are ~ 60%, the target is >70%!
* Average oestrus detection rates are ~ 60%, the target is >70%!
=== Standing to be Mounted ===
Although pedometers are increasingly being used and in-line milk progesterone tests are being developed, the most reliable method for determining the optimum timing of artificial insemination (AI) is the observation of cows standing to be mounted (STBM).
* Ovulation occurs approximately 30 hours after the first display of STBM, which in turn is 24 hours after the LH surge.
* The optimum time to inseminate in order to achieve the best conception rates is six to 24 hours after the first observed STBM.
== Signs of Oestrus ==
== Signs of Oestrus ==
Successful oestrus detection is reliant both on observation and the display of oestrous
Successful oestrus detection is reliant both on observation and the display of oestrous
behaviour. If either element is reduced, this has serious effects on detection and thus submission rates.A period of 30 minutes observation at least three times daily is recommended.
behaviour. If either element is reduced, this has serious effects on detection and thus submission rates.A period of 30 minutes observation at least three times daily is recommended.
=== Progesterone Levels ===
=== Progesterone Levels ===