What is the typical age classification for a cow that has had at least one calf?

A cow that has had at least one calf is classified as a cow. This classification indicates maturity and the ability to reproduce. Heifers are typically defined as young female cattle that have not yet had a calf, while calves refer to very young animals of both sexes. Steers are male cattle that have been castrated and cannot reproduce. Therefore, the term "cow" is specifically used to denote those females who have reached reproductive maturity and have already given birth, distinguishing them from younger or non-reproductive classifications.