| 11. | Estrus occurs for only one day during the breeding season.
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| 12. | They are seasonal breeders and come into estrus around October.
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| 13. | Proestrus and estrus can last anywhere from 5 days to 21 days.
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| 14. | It was released on Estrus Records in 1993 on black vinyl only.
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| 15. | Eileen Tabios : The Estrus Gaze ( s ) 66.
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| 16. | There are two major and contrasting factors the modulate estrus.
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| 17. | Cows showed their first estrus at the average age of 36 months.
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| 18. | Menstrual periods are distinctive to great apes as " cryptic estrus ".
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| 19. | The garage-rock label Estrus scheduled several benefits.
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| 20. | Cows are in estrus for only about 12 hours.
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