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Oestrous Cycle - Anatomy & Physiology (view source)
Revision as of 14:38, 11 September 2008
, 14:38, 11 September 2008→Oestrous Cycle
=== Oestrous Cycle ===
=== Oestrous Cycle ===
* Seasonally polyoestrous
* Long day breeders with a period of anoestrus beginning in late autumn.
* Increasing daylight is the most important factor for inducing the resumption of reproductive activity. The first oestrus will usually occur soon after the shortest day of the year.
* If constant 14 hours of daylight is provided, the queen will continue to cycle all year round.
* Some non-pedigrees have regular oestrous cycles lasting about 3 weeks, but others show no regular pattern.
* Duration of oestrus is 7-10 days regardless of mating.
* Oestrogen concentrations increase dramatically at the time of oestrus and may double over 24 hours.
* The principle oestrogen is Oestradiol 17
=== Mating and Ovulation ===
=== Mating and Ovulation ===