A female bovine bred for dairy production that has not had a calf.
Not quite. Female "baby dairy cows" are called heifer calves; "baby cows" are called calves--singular is calf. A heifer is actually a female bovine that has been weaned but has never given birth to a calf. She is called a first-calf heifer (or cow, depending on how you look at it) when she does.
Whenever and after she calves, which is usually at around 24 months of age.
Hays, Gowan had the Grand Champion Dairy Heifer at the Roosevelt Co Fair 2008. Good Job Gowan!
About 290 days, which is about 9 months and 20 days.
You could call it a heifer, or a twin heifer if the sibling is also a heifer, or a freemartin if the heifer's sib is a bull calf.
It would and it wouldn't. You could ruin the heifer by doing this, as dairy cattle always put more energy into producing milk than energy into keeping their weight up. When she's lactating, she will be putting all her resources into milk production, and feeding a low quality hay might just be the thing that could really pull her down. I do know that if you feed a lower quality feed this will reduce milk production. But it also depends on the breed: if you didn't want to milk her, why did you get a Jersey in the first place? You should've purchased an Angus heifer or a Hereford heifer or any kind of heifer that is not a dairy heifer. So this is a real catch 22 situation for you.
A steer or bull cow is a male cow. The female cow is usually called a heifer. A dairy cow is sometimes called a milker.
Cow, first-calf heifer, bred heifer, heifer, heifer calf or spayed heifer. See the related question below.
An unpregnant heifer.
The gender of a heifer is female.
A springing heifer is a heifer who is within a few weeks of delivering her first calf.
It's the name for a heifer that has had her first calf and is currently raising her first calf. It's also a name for a heifer that came from a heifer or cow that was that heifer or cow's first calf.