A Heifer is a Bovine female less than three years of age who has not borne a calf. Young cows with their first calves are often called first-calf Heifers.

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Other /More definition:
A Heifer is a bovine female less than three years of age who has not borne a calf. Young cows with their first calves are often called first-calf Heifers.

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Other /More definition:
A Heifer is Young female bovine cow prior to the time that she has produced her first calf.