Is it permissible to substitute a female camel older than the specifically required age category in Zakat?

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If the owner agrees, it is permissible to render a *Thaniyyah* (a female camel that has completed five years and entered the sixth) instead of the required age. This animal is named *Thaniyyah* because it has shed its first pair of incisors. This classification regarding ages was cited by Abu Ubayd and narrated from al-Asma'i, Abu Zayd al-Ansari, and Abu Ziyad al-Kilabi, among others.