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Dog Copulatory Behaviour - Anatomy & Physiology (view source)
Revision as of 12:36, 10 July 2008
, 12:36, 10 July 2008New page: == First Stage Coitus - The Tie == * Bitch in Oestrus spots bloody fluid just before the receptive stage. * Male identifies the female. ** Dogs are very aware of a bitch in oestrus and ...
== First Stage Coitus - The Tie ==
* Bitch in Oestrus spots bloody fluid just before the receptive stage.
* Male identifies the female.
** Dogs are very aware of a bitch in oestrus and can detect them from 500-600 meters away.
* Bitch adopts receptive posture (''''stands'''') with the tail deviated to one side (''''flagging'''').
* Dog mounts and thrusts to achieve intromission.
** '''Intromission''' with a partially erect penis aided by the '''Os Penis'''
* Vulval erectile tissue of the bitch grips the '''bulbus glandis''' of the penis.
* Penis achieves full '''erection''' (the ''''Tie'''')
* Lasts 1-2 minutes
* First and second fractions of semen are ejaculated.
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== The Turn ==
* Shortly after ejaculation, the dog dismounts and turns around while lifting one hind leg over the bitch.
* The male and female remain 'tied' because the '''bulbus glandis''' of the penis remains engorged with blood.
* Contractions of muscles near the base of the penis prevent venous outflow of blood from the bulbus glandis.
* Sphincter muscles of the '''vulva''' constrict
** Compresses dorsal veins of the penis.
** Prevents venous outflow.
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== Second Stage Coitus ==
* After the turn,they stand with their hind quarters in contact and their heads facing opposite directions.
* Third fraction of semen is ejaculated.
* Lasts 5-45 minutes
* Encourages uterine rather than vaginal insemination.
* Dog steadily ejaculates up to 30ml '''seminal fluid'''.
** Delivered through the Cervix to the Uterus.
** Forces the sperm-rich fraction into the Uterus.
* Dog then turns to face the opposite direction (the ''''Turn'''')
* '''Ejaculation'''