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Oestrous Cycle - Anatomy & Physiology (view source)
Revision as of 12:40, 9 April 2011
, 12:40, 9 April 2011→Oestrous Cycle
* In cows, the average length of the oestrous cycle is 21 days (18-24).
* In cows, the average length of the oestrous cycle is 21 days (18-24).
* The average duration of oestrus is ~ 15 hours (2-30 hours).
* The average duration of oestrus is ~ 15 hours (2-30 hours).
* The body temperature of dairy cows dalls ~0.5◦C the day before oestrus. It then increases in oestrus before falling by ~0.3◦C at ovulation.
* The body temperature of dairy cows falls by ~0.5◦C the day before oestrus. It then increases in oestrus before falling by ~0.3◦C at ovulation.
* Vaginal pH also fluctuates throughout the oestrous cycle, but is lowest (7.32) on the day of oestrus.
* Vaginal pH also fluctuates throughout the oestrous cycle, but is lowest (7.32) on the day of oestrus.
* Ovulation is spontaneous, occuring ~12 hours after the end of oestrus.
* Ovulation is spontaneous, occuring ~12 hours after the end of oestrus.