Difference between revisions of "Dog Copulatory Behaviour - Anatomy & Physiology"
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== First Stage Coitus - The Tie == | == First Stage Coitus - The Tie == | ||
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* Bitch in Oestrus spots bloody fluid just before the receptive stage. | * Bitch in Oestrus spots bloody fluid just before the receptive stage. | ||
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* Penis achieves full '''erection''' (the ''''Tie'''') | * Penis achieves full '''erection''' (the ''''Tie'''') | ||
* Lasts 1-2 minutes | * Lasts 1-2 minutes | ||
− | * First and second fractions of semen are [[ | + | * First and second fractions of semen are [[Reproductive_Behaviour_-_Copulatory_Behaviour_-_Anatomy_%26_Physiology#Ejaculation|ejaculated]]. |
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== The Turn == | == The Turn == | ||
− | * Shortly after [[ | + | * Shortly after [[Reproductive_Behaviour_-_Copulatory_Behaviour_-_Anatomy_%26_Physiology#Ejaculation|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. | * 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. | * Contractions of muscles near the base of the penis prevent venous outflow of blood from the bulbus glandis. | ||
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** Compresses '''dorsal veins''' of the penis. | ** Compresses '''dorsal veins''' of the penis. | ||
** Prevents venous outflow. | ** Prevents venous outflow. | ||
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== Second Stage Coitus == | == Second Stage Coitus == | ||
* After the turn,they stand with their hind quarters in contact and their heads facing opposite directions. | * After the turn,they stand with their hind quarters in contact and their heads facing opposite directions. | ||
− | * Third fraction of semen is [[ | + | * Third fraction of semen is [[Reproductive_Behaviour_-_Copulatory_Behaviour_-_Anatomy_%26_Physiology#Ejaculation|ejaculated]]. |
* Lasts 5-45 minutes | * Lasts 5-45 minutes | ||
* Encourages uterine rather than vaginal insemination. | * Encourages uterine rather than vaginal insemination. | ||
* Dog steadily ejaculates up to 30ml '''seminal fluid'''. | * Dog steadily ejaculates up to 30ml '''seminal fluid'''. | ||
− | ** Delivered through the [[ | + | ** Delivered through the [[Female_Reproductive_Tract_-The_Cervix_-_Anatomy_%26_Physiology|Cervix]] to the [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology|Uterus]]. |
− | ** Forces the sperm-rich fraction into the [[ | + | ** Forces the sperm-rich fraction into the [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology|Uterus]]. |
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− | + | * Dog then turns to face the opposite direction (the ''''Turn'''') | |
− | + | * '''Ejaculation''' |
Revision as of 12:39, 10 July 2008
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.
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.
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.
- Dog then turns to face the opposite direction (the 'Turn')
- Ejaculation