Difference between revisions of "Chinchilla Reproduction - Anatomy & Physiology"
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m (Text replace - "-_Anatomy_%26_Physiology" to "- Anatomy & Physiology") |
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=== Penis === | === Penis === | ||
− | * Penis points caudally when relaxed and cranially when [[Reproductive_Behaviour_-_Erection_- | + | * Penis points caudally when relaxed and cranially when [[Reproductive_Behaviour_-_Erection_- Anatomy & Physiology|erect]]. |
* 1.5cm in length | * 1.5cm in length | ||
* '''Sigmoid flexure''' | * '''Sigmoid flexure''' | ||
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=== Copulation === | === Copulation === | ||
− | * [[Male_Reproductive_Tract_-Spermatogenesis_and_Spermiation_- | + | * [[Male_Reproductive_Tract_-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. | ||
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=== Reproductive Tract === | === Reproductive Tract === | ||
− | * [[Female_Reproductive_Tract_-The_Ovary_- | + | * [[Female_Reproductive_Tract_-The_Ovary_- Anatomy & Physiology|Ovaries]] are just caudolateral to the [[Macroscopic Renal Anatomy - Anatomy & Physiology#Common Anatomy|kidneys]]. |
− | * [[Female_Reproductive_Tract_-The_Uterus_- | + | * [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology#Anatomical_Types_of_Uteri|Bicornuate duplex uterus]]. |
− | * [[Female_Reproductive_Tract_-The_Uterus_- | + | * [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology|Uterine lumena]] do not fuse. |
− | ** The two uterine horns continue into seperate [[Female_Reproductive_Tract_-The_Cervix_- | + | ** The two uterine horns continue into seperate [[Female_Reproductive_Tract_-The_Cervix_- Anatomy & Physiology|cervices]] |
− | ** Open separately into a single [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- | + | ** Open separately into a single [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- Anatomy & Physiology|vagina]]. |
− | * Membrane covers [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- | + | * Membrane covers [[Female_Reproductive_Tract_-The_Vagina/Vestibule_- Anatomy & Physiology|vaginal]] opening except at oestrus and during [[Reproductive System - Anatomy & Physiology#Parturition|parturition]]. |
=== Puberty and Sexual Maturity === | === Puberty and Sexual Maturity === |
Revision as of 15:23, 29 November 2010
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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.