| 1. | The embryo was implanted into a surrogate mother cat in estrus.
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| 2. | A female's estrus cycle is about 19 days long.
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| 3. | It is only during estrus that copulation will result in pregnancy.
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| 4. | The female comes into estrus once a year in the spring.
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| 5. | Unlike modern breeds, pariah dogs have one annual estrus cycle.
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| 6. | The previous best was Estrus Crayton's 700 yards in 1992.
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| 7. | Mothers will help their sons get more matings from females in estrus.
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| 8. | Breeding occurs between June and August when the females come into estrus.
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| 9. | Females experience estrus again about a month after producing young.
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| 10. | Either sex may approach the other when the female is in estrus.
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