| 11. | Both mules and hinnies can be either male or female, but they are almost invariably sterile.
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| 12. | Thus, a hinny is restricted to being about the size of the largest breed of donkey.
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| 13. | Female hinnies and mules are not customarily spayed, and may or may not go through estrus.
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| 14. | Namely, in China, in 1981, a hinny mare proved fertile with a donkey sire.
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| 15. | When the drake is a pekin, the offspring tend to be smaller and are called hinnies.
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| 16. | "Hinny " is a term of endearment in the dialects of the Newcastle area.
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| 17. | Male hinnies and mules are usually castrated to help control their behavior by eliminating their interest in females.
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| 18. | Other than size, some additional minor differences occur that can be used to distinguish between mules and hinnies.
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| 19. | DNA testing revealed the foal has a mixed karyotype hybrid like the Chinese hinny offspring " Dragon Foal ."
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| 20. | A hinny is a cross between a stallion and an ass; it has a bushier tail than a mule.
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