A heifer is young female bovine that has never given birth to a calf. A heifer may be considered a cow if: She successfully gives birth and raises her second calf She reaches adult maturity at 4...
A pregnant heifer is still a heifer because she still hasn't had a calf yet. She only becomes a cow after she's had her calf or after her second calf.
A springing heifer is a heifer who is within a few weeks of delivering her first calf.