If this is a joke, it's a milkshake. If this is not a joke, it will be a joke - a nervous cow.
There's not really an answer... You just call it a cow...
The Boss Cow, Lead Cow, or Top Cow.
Momma cow.
Just a cow.
every cow moos
I believe you would call it a "heifer".
They call him/her a calf.
A cow shed. A cow shed is called a BYRE
A grazing cow or grazer.
An open or barren cow.
A heavily pregnant cow, or a long-bred cow. Or, a cow that is expecting soon.