Ann Treneman, The Times, August 30, 2019
Most dictionaries define a ‘heifer’ as a cow over one year old which has not had a calf. One or two extend the definition to a cow which has had one calf. I doubt if the dog-walker would have known the exact maternity history of the animal involved, but ‘cow’ would obviously cover every eventuality. I imagine the sub was one of the familiar type these days who feel it is somehow not cool to have knowledge about the natural world.