Estrous Cycle: Difference between revisions
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* '''Metestrus-1''' - Vaginal tissues are pale and dry. Dorsal lip is not as edematous as in estrus. | * '''Metestrus-1''' - Vaginal tissues are pale and dry. Dorsal lip is not as edematous as in estrus. | ||
* '''Metestrus-2''' - Vaginal signs are similar to metestrus-1, but the lip is less edematous and has receded. Whitish cellular debris may line the inner walls or partially fill the Vagina. | * '''Metestrus-2''' - Vaginal signs are similar to metestrus-1, but the lip is less edematous and has receded. Whitish cellular debris may line the inner walls or partially fill the Vagina. | ||
==Pig Estrous Cycle== | |||
The feedback systems between the ovaries, uterus, hypothalamus and pituitary gland govern a cycle of events that takes 18-21 days. If conception occurs this cyclic pattern is interrupted and pregnancy is maintained for approximately 114 days. Removal of the sucking stimulus at weaning triggers a new sequence of events. | |||
==References== | ==References== |
Revision as of 21:16, 21 April 2010
Introduction
The estrous cycle (British spelling, oestrous) is the main reproductive cycle of other species females of non-primate vertebrates, for example rats, mice, horses, pig have this form of reproductive cycle. There are also a variety of different forms:
- Polyestrous Animals - Estrous cycles throughout the year (cattle, pigs, mouse, rat).
- Seasonally Polyestrous Animals - Animals that have multiple estrous cycles only during certain periods of the year (horses, sheep, goats, deer, cats).
- Monestrous Animals - Animals that have one estrous cycle per year (dogs, wolves, foxes, and bear)
Mouse Estrous Cycle
The mouse oestrus cycle is 4-6 days, with oestrus lasting less than 1 day. (More? Other Embryos- Mouse Estrous Cycle)
The oestrus cycle stops during lactation except for one oestrus 12-20 hours postpartum.
Determining the stage of the estrous cycle in the mouse by the appearance of the vagina.[1]
- Estrous Diestrus - Vagina has a small opening and the tissues are bluish-purple in color and very moist.
- Proestrus - Vagina is gaping and the tissues are reddish-pink and moist. Numerous longitudinal folds or striations are visible on both the dorsal and ventral lips.
- Estrus - Vaginal signs are similar to proestrus, but the tissues are lighter pink and less moist, and the striations are more pronounced.
- Metestrus-1 - Vaginal tissues are pale and dry. Dorsal lip is not as edematous as in estrus.
- Metestrus-2 - Vaginal signs are similar to metestrus-1, but the lip is less edematous and has receded. Whitish cellular debris may line the inner walls or partially fill the Vagina.
Pig Estrous Cycle
The feedback systems between the ovaries, uterus, hypothalamus and pituitary gland govern a cycle of events that takes 18-21 days. If conception occurs this cyclic pattern is interrupted and pregnancy is maintained for approximately 114 days. Removal of the sucking stimulus at weaning triggers a new sequence of events.
References
- ↑ Determining the stage of the estrous cycle in the mouse by the appearance of the vagina. Champlin AK, Dorr DL, Gates AH. Biol Reprod. 1973 May;8(4):491-4. PMID: 4736343
Reviews
Articles
- Su P, Wu JC, Sommer JR, Gore AJ, Petters RM, Miller WL. [See Related Articles] Conditional induction of ovulation in mice. Biol Reprod. 2005 Oct;73(4):681-7.
- Champlin AK, Dorr DL, Gates AH. [See Related Articles] Determining the stage of the estrous cycle in the mouse by the appearance of the vagina. Biol Reprod. 1973 May;8(4):491-4.
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Cite this page: Hill, M.A. (2024, May 3) Embryology Estrous Cycle. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Estrous_Cycle
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G