| 11. | :: Cows have a 21 day Estrous cycle.
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| 12. | One signal is released during the follicular phase of the estrous cycle and it shortens estrous cycles.
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| 13. | One signal is released during the follicular phase of the estrous cycle and it shortens estrous cycles.
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| 14. | Typically, estrous cycles continue until death.
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| 15. | This mutual lengthening and shortening of estrous cycles was theorized to produce synchronization of estrous cycles over time.
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| 16. | The second signal is released during the ovulatory phase of the estrous cycle and it lengthens estrous cycles.
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| 17. | This mutual lengthening and shortening of estrous cycles was theorized to produce synchronization of estrous cycles over time.
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| 18. | Indeed, ovandrotone albumin has been found to significantly increase luteinizing hormone levels throughout the estrous cycle in ewes.
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| 19. | The second signal is released during the ovulatory phase of the estrous cycle and it lengthens estrous cycles.
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| 20. | Humans do not display their estrous cycle externally and like Bonobos use sex for social reasons unrelated to procreation.
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