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Chinchilla Reproduction - Anatomy & Physiology (view source)
Revision as of 11:31, 21 July 2008
, 11:31, 21 July 2008no edit summary
* Large fat body extends cranially into the abdominal cavity from the cranial pole of each testis.
* Large fat body extends cranially into the abdominal cavity from the cranial pole of each testis.
== Accessory Sex Glands==
== Accessory Sex Glands==
* '''Bulbourethral glands''' are dorsolateral to '''ischiocavernosus muscles'''.
* '''Bulbourethral glands''' are dorsolateral to '''ischiocavernosus muscles'''.
** Isciocavernosus muscles are enormous, swelling on either side of the rectum and meeting over its top.
** Isciocavernosus muscles are enormous, swelling on either side of the rectum and meeting over its top.
== Penis ==
== Penis ==
** The small supporting bone is known as the '''baculum'''.
** The small supporting bone is known as the '''baculum'''.
== Copulation ==
== Copulation ==
* Breeds all year round.
* Breeds all year round.
* '''Copulatory plug''' at mating.
* '''Copulatory plug''' at mating.
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= FEMALE =
== Reproductive Tract ==
* [[Female_Reproductive_Tract_-The_Ovary_-_Anatomy_%26_Physiology|Ovaries]] are just caudolateral to the [[Kidney_-_Comparative_Anatomy_%26_Physiology|kidneys]].
* [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology#Anatomical_Types_of_Uteri|Bicornuate duplex uterus]].
* [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology|Uterine lumena]] do not fuse.
** The two uterine horns continue into seperate [[Female_Reproductive_Tract_-The_Cervix_-_Anatomy_%26_Physiology|cervices]]
** Open separately into a single [[Female_Reproductive_Tract_-The_Vagina/Vestibule_-_Anatomy_%26_Physiology|vagina]].
* Membrane covers [[Female_Reproductive_Tract_-The_Vagina/Vestibule_-_Anatomy_%26_Physiology|vaginal]] opening except at oestrus and during [[Reproductive_System#Parturition|parturition]].
== Puberty and Sexual Maturity ==
* '''Puberty''' at ~8 months
** Puberty can be same year as birth, but if the chinchilla is born late in the year it will not reach puberty until the next breading season.
== Oestrous Cyclicity ==
* In the Northern Hemisphere the breeding season is November-May.
* Seasonally polyoestrus with a mean cycle of ~40 days.
* Post-partum oestrus.
** Often two litters per year, three are possible.
* Breeding life is ~10 years.
== Gestation and Offspring==
* Long [[Reproductive_System#Gestation|gestation]] period: 111 days
* Litter size 1-6
* Precocious offspring
** Weaning age is 6 weeks.
== Mammary Gland ==
* Three pairs
** One inguinal pair
** Two lateral thoracic
* Teats protrude sideways, allowing the young to sit beside the dam and suckle.