In ancient Persian texts, "کاوکیل", " کاکیل ", " کالیل " and " "کاوکثل has refered to one of the festivals of ancient Iran and a particular breed of cattle. The purpose of this article is to revies these signs and express their implications. To this end, it is shown, first, that according to antique Persian handwriting, the mentioned forms are as the other spellings of Gawkil; then, it is suggested that "Kil" in this application is the equivalent of "Kaj" (in Persian means crooked), which is obtained by the combination of two words"Kaj& Kul" and is used in new Persian language.Based on the findings of this study, "Gawkil" is used to call a breed of a cow with long hair and a tail like horse tail that one of its habitats is some parts of large Khorasan. In Persian texts, it is also referred to as "Kaj’gaaw", "Ghaj’gaaw" and "Ghash’ghaa ". Considering the connotative meaning of "kej" in the Parthian language and "kil" in the ancient translations of the Qur'an, "Kaj’gaaw / Gaaw kil" can be considered equivalent to a rogue cow.
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