Difference between revisions of "Hamster Reproduction - Anatomy & Physiology"

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<big><center>[[Reproductive System|'''BACK TO REPRODUCTIVE SYSTEM''']]</center></big>
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<big><center>[[Reproductive_System#Small_Domestic_Mammals|'''BACK TO SMALL DOMESTIC MAMMALS''']]</center></big>
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* [[Hamster-Male- Anatomy & Physiology|Male]]
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* [[Hamster-Female- Anatomy & Physiology|Female]]
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== Male ==
 
== Male ==
  
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The anogenital distance is longer in the male, which has a more prominent genital papilla.
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=== Penis ===
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== Penis ==
  
 
* Os penis lies within the tissue of the penis.
 
* Os penis lies within the tissue of the penis.
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** Supporting bone is the Baculum.
 
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*** Baculum consists of two lateral prongs and a dorsal prong.
 
  
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=== Testes===
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----
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== Testes==
  
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* Two large testes in an external scrotum.
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* Two testes in an external scrotum.
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** Retained in the scrotum by a pad of fat in the inguinal canal.
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* Chinese Hamster
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* Chinese Hamster:
 
 
** Testes remain internal.
 
** Testes remain internal.
  
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=== Accessory Sex Glands ===
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----
  
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* Several large [[Accessory Sex Glands - Anatomy & Physiology|accessory glands]] including:
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== Accessory Sex Glands ==
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** Ampulla Glands
 
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** Seminal Vesicles
 
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** Coagulating Glands
 
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** Prostate (three-lobed)
 
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** Bulbourethral Glands
 
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* Produce a urethral plug.
 
  
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* Several large [[Male_Reproductive_Tract_-Accessory_Sex_Glands_-_Anatomy_%26_Physiology|accessory glands]].
 
* Scent gland on each flank to mark territory.
 
* Scent gland on each flank to mark territory.
  
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=== Mammary Gland===
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----
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== Mammary Gland==
  
 
* Teats are absent.
 
* Teats are absent.
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----
  
 
== Female ==
 
== Female ==
  
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=== Reproductive Tract ===
 
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==== Ovary ====
 
  
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* [[Ovary - Anatomy & Physiology|Ovaries]] are oval in shape, situated dorsolateral to the kidneys.
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== Reproductive Tract ==
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** Completely enclosed in a fat-filled ovarian bursa.
 
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** Uterine artery provides a major blood supply to the [[Ovary - Anatomy & Physiology|ovary]].
 
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** Coils of the ovarian and uterine arteries anastoamose close to the [[Ovary - Anatomy & Physiology|ovary]].
 
  
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==== Oviduct ====
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* Bicornuate uterus
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** Two long uterine horns
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** Little uterine body
  
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* [[Oviduct - Anatomy & Physiology|Oviduct]] is long and tighly coiled.
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----
  
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==== Uterus ====
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== Oestrous Cyclicity ==
  
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* [[Uterus - Anatomy & Physiology#Anatomical_Types_of_Uteri|Duplex Uterus]]
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* Spontaneous ovulator.
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** Two seperate [[Cervix - Anatomy & Physiology|cervices]].
 
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** Uterine horns remain divided until uniting in a single [[Vagina and Vestibule - Anatomy & Physiology|vagina]].
 
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==== Vagina ====
 
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* The urinary opening is cranial and the anus is caudal with the vaginal opening in between.
 
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* [[Vagina and Vestibule - Anatomy & Physiology|Vagina]] has a pair of vaginal pouches.
 
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** Extend caudally, terminating at the level of the vaginal orifice.
 
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=== Oestrous Cyclicity ===
 
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* Spontaneous [[Ovulation - Anatomy & Physiology|ovulator]].
 
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** [[Ovulation - Anatomy & Physiology|Ovulation]] occurs ~ 12 hours after the LH surge, usually resulting in the release of ova at night (hamsters are nocturnal).
 
 
* Seasonally polyoestrus
 
* Seasonally polyoestrus
 
* Oestrus every 5-7 days
 
* Oestrus every 5-7 days
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** Secretes copious white vaginal discharge during oestrus.
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** Secrete copious white vaginal discharge during oestrus.
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*** Changes consistency from stringy to waxy over the 3 day oestrus period.
 
 
* Post-partum oestrus
 
* Post-partum oestrus
  
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=== Copulation ===
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== Copulation ==
  
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* Lasts 30 minutes.
 
 
* Mating may be confirmed by the presence of a ''''copulatory plug''''.
 
* Mating may be confirmed by the presence of a ''''copulatory plug''''.
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** A creamy, gelatinous plug formed from secretions of the male [[Accessory Sex Glands - Anatomy & Physiology|accessory glands]].
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** A creamy, gelatinous plug formed from secretions of the male [[Male_Reproductive_Tract_-Accessory_Sex_Glands_-_Anatomy_%26_Physiology|accessory glands]].
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* Pseudopregnancy can occur after an infertile mating.
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=== Mammary Gland ===
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== Mammary Gland and Lactation ==
  
 
* 6 pairs of teats
 
* 6 pairs of teats
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* Extend from the thoracic to inguinal region.
 
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=== Breed Differences ===
 
  
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==== Syrian (Golden) hamster ====
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----
  
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[[Image:hamster fetus.jpg|thumb|right|150px|Syrian Hamster Foetus during Late Gestation- Courtesy of Andrew Crook, Copyright RVC 2008]]
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== Breed Differences ==
  
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* Sexually mature at 6-8 weeks  
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* '''Syrian (Golden) hamster'''
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* Gestation period: 6-8 days
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** Sexually mature at 6-8 weeks  
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* Litter size 5-9: offspring
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** Gestation period: 6-8 days
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** Litter size 5-9: offspring
 
** Weaned at 21-28 days.
 
** Weaned at 21-28 days.
  
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==== Russian Hamster ====
 
  
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* Sexually mature at 6-8 weeks  
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* '''Russian Hamster'''
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* Gestation period: 6-8 days
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** Sexually mature at 6-8 weeks  
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* Litter size: 4 offspring
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** Gestation period: 6-8 days
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** Will cannabilise young if disturbed.
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** Litter size: 4 offspring
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*** Will cannabilise young if disturbed.
 
** Weaned at 16-18 days.
 
** Weaned at 16-18 days.
  
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==== Chinese Hamster ====
 
  
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* Sexually mature at 7-14 weeks
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* '''Chinese Hamster'''
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* Gestation period 7-14 days  
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** Sexually mature at 7-14
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* Litter size: 4 offspring
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** Gestation period 7-14 days  
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** Will cannabilise young if disturbed.
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** Litter size: 4 offspring
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*** Will cannabilise young if disturbed.
 
** Weaned at 21 days.
 
** Weaned at 21 days.
  
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[[Category:Small Mammal Reproduction]]
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----
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[[Category:Bullet Points]]
 

Revision as of 12:49, 18 July 2008

BACK TO REPRODUCTIVE SYSTEM
BACK TO SMALL DOMESTIC MAMMALS


Male

Penis

  • Os penis lies within the tissue of the penis.

Testes

  • Two testes in an external scrotum.
  • Chinese Hamster
    • Testes remain internal.

Accessory Sex Glands

Mammary Gland

  • Teats are absent.

Female

Reproductive Tract

  • Bicornuate uterus
    • Two long uterine horns
    • Little uterine body

Oestrous Cyclicity

  • Spontaneous ovulator.
  • Seasonally polyoestrus
  • Oestrus every 5-7 days
    • Secrete copious white vaginal discharge during oestrus.
  • Post-partum oestrus

Copulation

  • Mating may be confirmed by the presence of a 'copulatory plug'.

Mammary Gland and Lactation

  • 6 pairs of teats

Breed Differences

  • Syrian (Golden) hamster
    • Sexually mature at 6-8 weeks
    • Gestation period: 6-8 days
    • Litter size 5-9: offspring
    • Weaned at 21-28 days.


  • Russian Hamster
    • Sexually mature at 6-8 weeks
    • Gestation period: 6-8 days
    • Litter size: 4 offspring
      • Will cannabilise young if disturbed.
    • Weaned at 16-18 days.


  • Chinese Hamster
    • Sexually mature at 7-14
    • Gestation period 7-14 days
    • Litter size: 4 offspring
      • Will cannabilise young if disturbed.
    • Weaned at 21 days.
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