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You could call it a heifer, or a twin heifer if the sibling is also a heifer, or a freemartin if the heifer's sib is a bull calf.
Cow, first-calf heifer, bred heifer, heifer, heifer calf or spayed heifer. See the related question below.
An unpregnant heifer.
The gender of a heifer is female.
A springing heifer is a heifer who is within a few weeks of delivering her first calf.