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Chinchilla Reproduction - Anatomy & Physiology (view source)
Revision as of 13:50, 5 July 2012
, 13:50, 5 July 2012→Mammary Gland
== MALE ==
=== Scrotum and Testes ===
= MALE =
== Scrotum and Testes ==
* Only a very slight scrotal region is visible externally (no true scrotum).
* Only a very slight scrotal region is visible externally (no true scrotum).
* Thin-walled '''scrotal diverticula''' extend cranially on either side of the base of the penis.
* Thin-walled '''scrotal diverticula''' extend cranially on either side of the base of the penis.
* 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===
* '''Vesicular glands''' are very long and tubular.
==== Vesicular Glands ====
* Very long and tubular.
== Penis ==
==== Prostate Gland ====
* Penis points caudally when relaxed and cranially when [[Reproductive_Behaviour_-_Erection_-_Anatomy_%26_Physiology|erect]].
* Paired large ventral lobes and paired small dorsal lobes.
==== Bulbourethral Glands ====
* Dorsolateral to '''ischiocavernosus muscles'''.
** Ischiocavernosus muscles are enormous, swelling on either side of the rectum and meeting over its top.
=== Penis ===
* Penis points caudally when relaxed and cranially when [[Erection - Anatomy & Physiology|erect]].
* 1.5cm in length
* 1.5cm in length
* '''Sigmoid flexure'''
* '''Sigmoid flexure'''
** The small supporting bone is known as the '''baculum'''.
** The small supporting bone is known as the '''baculum'''.
== Copulation ==
=== Copulation ===
* [[Male_Reproductive_Tract_-Spermatogenesis_and_Spermiation_-_Anatomy_%26_Physiology&action|Spermatogenesis]] occurs at about 2-3 months.
* [[Spermatogenesis_and_Spermiation_- Anatomy & Physiology|Spermatogenesis]] occurs at about 2-3 months.
* Copulatory maturity is not until about 8 months.
* Copulatory maturity is not until about 8 months.
* Breeds all year round.
* Breeds all year round.
* '''Copulatory plug''' at mating.
* '''Copulatory plug''' at mating.
== FEMALE ==
=== Reproductive Tract ===
* [[Ovary - Anatomy & Physiology|Ovaries]] are just caudolateral to the [[Renal Anatomy - Anatomy & Physiology#Common Anatomy|kidneys]].
* [[Uterus - Anatomy & Physiology#Anatomical_Types_of_Uteri|Bicornuate duplex uterus]].
* [[Uterus - Anatomy & Physiology|Uterine lumena]] do not fuse.
** The two uterine horns continue into seperate [[Cervix - Anatomy & Physiology|cervices]]
** Open separately into a single [[Vagina and Vestibule - Anatomy & Physiology|vagina]].
* Membrane covers [[Vagina and Vestibule - Anatomy & Physiology|vaginal]] opening except at oestrus and during [[Normal Parturition - Anatomy & Physiology|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===
==== Gestation ====
* Long gestation period: 111 days.
==== Litter ====
* 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.
[[Category:Small Mammal Reproduction]]
[[Category:Bullet Points]]