| 21. | The estrous cycle of a mare occurs roughly every 19 22 days and occurs from early spring into autumn.
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| 22. | In mammals, it can occur only where there are two uteri, or where the estrous cycle continues through pregnancy.
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| 23. | :: : : For the " actual " facts, please consult the articles I mentioned above, especially estrous cycle.
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| 24. | Ductal development decreases with the arrival of sexual maturity and undergoes estrous cycles ( proestrus, estrus, metestrus, and diestrus ).
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| 25. | One difference is that animals that have estrous cycles reabsorb the endometrium if conception does not occur during that cycle.
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| 26. | The estrous cycle lasts between 22 and 30 days and menopause has been reported in captive orangutans at about age 48.
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| 27. | Mating takes place only in the final phase of the female's estrous cycle, and is performed hanging upside-down from a branch.
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| 28. | As a result of estrous cycling, the mammary gland undergoes dynamic changes where cells proliferate and then regress in an ordered fashion.
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| 29. | The Djungarian hamster's estrous cycle lasts four days, this means every four days, the female may accept the male back to breed again.
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| 30. | Dog bitches have an estrous cycle that is nonseasonal and monestrus, i . e . there is only one estrus per estrous cycle.
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