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 == | ||
− | + | === Scrotum and Testes === | |
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− | = | ||
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− | == 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. | ||
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− | == Accessory Sex Glands== | + | === Accessory Sex Glands=== |
− | === Vesicular Glands === | + | ==== Vesicular Glands ==== |
* Very long and tubular. | * Very long and tubular. | ||
− | === Prostate Gland === | + | ==== Prostate Gland ==== |
* Paired large ventral lobes and paired small dorsal lobes. | * Paired large ventral lobes and paired small dorsal lobes. | ||
− | === Bulbourethral Glands === | + | ==== Bulbourethral Glands ==== |
* Dorsolateral to '''ischiocavernosus muscles'''. | * Dorsolateral to '''ischiocavernosus muscles'''. | ||
** Ischiocavernosus muscles are enormous, swelling on either side of the rectum and meeting over its top. | ** Ischiocavernosus muscles are enormous, swelling on either side of the rectum and meeting over its top. | ||
− | == Penis == | + | === Penis === |
* Penis points caudally when relaxed and cranially when [[Reproductive_Behaviour_-_Erection_-_Anatomy_%26_Physiology|erect]]. | * Penis points caudally when relaxed and cranially when [[Reproductive_Behaviour_-_Erection_-_Anatomy_%26_Physiology|erect]]. | ||
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− | == Copulation == | + | === Copulation === |
* [[Male_Reproductive_Tract_-Spermatogenesis_and_Spermiation_-_Anatomy_%26_Physiology|Spermatogenesis]] occurs at about 2-3 months. | * [[Male_Reproductive_Tract_-Spermatogenesis_and_Spermiation_-_Anatomy_%26_Physiology|Spermatogenesis]] occurs at about 2-3 months. | ||
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* '''Copulatory plug''' at mating. | * '''Copulatory plug''' at mating. | ||
− | + | == FEMALE == | |
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− | = FEMALE = | ||
− | == 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_Ovary_-_Anatomy_%26_Physiology|Ovaries]] are just caudolateral to the [[Kidney_-_Comparative_Anatomy_%26_Physiology|kidneys]]. | ||
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− | == Puberty and Sexual Maturity == | + | === Puberty and Sexual Maturity === |
* '''Puberty''' at ~8 months | * '''Puberty''' at ~8 months | ||
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− | == Oestrous Cyclicity == | + | === Oestrous Cyclicity === |
* In the Northern Hemisphere the breeding season is November-May. | * In the Northern Hemisphere the breeding season is November-May. | ||
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− | == Gestation and Offspring== | + | === Gestation and Offspring=== |
− | === Gestation === | + | ==== Gestation ==== |
* Long [[Reproductive_System#Gestation|gestation]] period: 111 days. | * Long [[Reproductive_System#Gestation|gestation]] period: 111 days. | ||
− | === Litter === | + | ==== Litter ==== |
* Litter size 1-6 | * Litter size 1-6 | ||
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** Weaning age is 6 weeks. | ** Weaning age is 6 weeks. | ||
− | == Mammary Gland == | + | === Mammary Gland === |
* Three pairs | * Three pairs | ||
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** 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.