| 21. | Females mark more often during the wet season when they are in estrus.
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| 22. | Rut in males and estrus in females does not depend on the season.
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| 23. | Detection of estrus, becomes reliant on observation in the absence of bulls.
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| 24. | Each estrus bout lasts for one or two days.
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| 25. | Soon after, the female has a postpartum estrus.
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| 26. | Fights between males usually occur over estrus females and involve biting and kicking.
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| 27. | Females reproduce every year, although postpartum estrus has been observed in captivity.
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| 28. | Estrum is sometimes used as a synonym for estrus.
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| 29. | In most other mammals females only mate during estrus.
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| 30. | During proestrus and estrus, females may have a clear to bloody discharge.
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