heifer – a young cow, especially one that has not had a calf
She's very heavy for (heifer) a young cow that hasn't had a calf yet.
Examples of heifer in a sentence
They were trying to sell the cow as a heifer but it was far from a young cow.
She couldn't believe her husband had gone and bought a heifer while she was at work.
The farmer couldn't believe how much the price of a heifer had gone up over the past few years.