Difference between revisions of "Chinchilla Reproduction - Anatomy & Physiology"
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| + | {{toplink | ||
| + | |backcolour =EED2EE | ||
| + | |linkpage =Reproductive System - Anatomy & Physiology | ||
| + | |linktext =Reproductive System | ||
| + | |maplink = Reproductive System (Content Map) - Anatomy & Physiology | ||
| + | |pagetype =Anatomy | ||
| + | |sublink1=Reproductive System - Anatomy & Physiology#Small Domestic Mammals | ||
| + | |subtext1=SMALL DOMESTIC MAMMALS | ||
| + | }} | ||
| + | <br> | ||
== MALE == | == MALE == | ||
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=== Penis === | === Penis === | ||
| − | * Penis points caudally when relaxed and cranially when [[ | + | * Penis points caudally when relaxed and cranially when [[Reproductive_Behaviour_-_Erection_-_Anatomy_%26_Physiology|erect]]. |
* 1.5cm in length | * 1.5cm in length | ||
* '''Sigmoid flexure''' | * '''Sigmoid flexure''' | ||
| Line 37: | Line 47: | ||
=== Copulation === | === Copulation === | ||
| − | * [[Spermatogenesis_and_Spermiation_- | + | * [[Male_Reproductive_Tract_-Spermatogenesis_and_Spermiation_-_Anatomy_%26_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. | ||
| Line 46: | Line 56: | ||
=== Reproductive Tract === | === 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 [[ | + | ** The two uterine horns continue into seperate [[Female_Reproductive_Tract_-The_Cervix_-_Anatomy_%26_Physiology|cervices]] |
| − | ** Open separately into a single [[ | + | ** Open separately into a single [[Female_Reproductive_Tract_-The_Vagina/Vestibule_-_Anatomy_%26_Physiology|vagina]]. |
| − | * Membrane covers [[ | + | * 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 and Sexual Maturity === | ||
| Line 72: | Line 83: | ||
==== Gestation ==== | ==== Gestation ==== | ||
| − | * Long gestation period: 111 days. | + | * Long [[Reproductive_System#Gestation|gestation]] period: 111 days. |
==== Litter ==== | ==== Litter ==== | ||
| Line 86: | Line 97: | ||
** Two lateral thoracic | ** Two lateral thoracic | ||
* Teats protrude sideways, allowing the young to sit beside the dam and suckle. | * Teats protrude sideways, allowing the young to sit beside the dam and suckle. | ||
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Revision as of 12:07, 3 September 2008
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MALE
Scrotum and Testes
- 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.
- Each diverticulum is occupied by the tail of the epididymis.
- On either side of the anus are two postanal sacs.
- Caudal epididymis can lie in the postanal sacs.
- Testes and head of the epididymis is in the region of the inguinal ring.
- Large fat body extends cranially into the abdominal cavity from the cranial pole of each testis.
Accessory Sex Glands
Vesicular Glands
- Very long and tubular.
Prostate Gland
- 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 erect.
- 1.5cm in length
- Sigmoid flexure
- Os penis in the distal portion.
- The small supporting bone is known as the baculum.
Copulation
- Spermatogenesis occurs at about 2-3 months.
- Copulatory maturity is not until about 8 months.
- Breeds all year round.
- Copulatory plug at mating.
FEMALE
Reproductive Tract
- Ovaries are just caudolateral to the kidneys.
- Bicornuate duplex uterus.
- Uterine lumena do not fuse.
- Membrane covers vaginal opening except at oestrus and during 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.