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.
No. Only a heifer calf twinned to a bull calf will be infertile, not twin heifer calves.
I would call her hamburger. Either that or a VERY expensive pasture ornament.This heifer may also be referred to as a cull because of this. It's best to get rid of her (turning her into the great food source as mentioned above), because she WILL turn into an expensive lawn ornament, or an animal that will take your money from you and give you nothing back in return!
No. A heifer would only be sterile if she was twinned with a bull calf.
Only if the twin is a heifer and if that twin has been tested negative for being a freemartin (IF she had been twinned with a bull calf). Twin heifers are both highly likely to get pregnant when they reach puberty.
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.
She can also be known as a heifer calf, heifer yearling (if she is a year old), or first time heifer (if she has given birth to her first calf).
A heifer.
If the mother is a virgin heifer, she will be called a First time heifer, any mothers older than that will be called Cows.
I believe you would call it a "heifer".
No. Heifers are female, bulls are male. Heifers cannot change their sex like some other creatures can. However, heifers that were born with a twin brother and shared the same placenta with her twin brother can develop bull-like characteristics. These are called Freemartins or Hermaphrodites. Hermaphrodites are 100% sterile, and a hermaphrodite heifer is a heifer that has both male and female sexual characteristics but can not fully become a bull like REAL bulls are.
This is false. Both heifers will be reproductive later in life when they reach puberty.However, you will get a heifer that is sterile if she was born with a twin brother, not a twin sister. This is because the production of testosterone inhibits the normal production of estradiol, which decreases the heifer's ability to properly produce normal reproductive organs during the first trimester of gestation. This only occurs if both calves are sharing the same placenta. It's less likely for the heifer calf to be a freemartin or hermaphrodite if she and her brother have separate placentas, where they are fraternal twins, not maternal.
Characteristics of a good heifer include a level top, smooth, long muscle, and a trim middle. The heifer should also have a long, wide, loin.