A heifer typically has her first calf around 2 years of age and can continue to have calves for about 10-12 years. On average, a heifer can have 10-12 calves over her breeding life, assuming she remains healthy and productive.
Twin heifer calves being infertile is not a common occurrence. If they are healthy and growing normally, there should be no issues with their fertility. However, it's always best to consult with a veterinarian for a more accurate assessment.
There is no such thing. Bull calves are male, never either male or female. Female calves are called heifer calves.
Cow, heifer, calves, buffalos
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.
The masculine form of heifer is bull. All baby cows, prior to sexing are referred to as calves. A castrated bull is called a steer.
Whenever and after she calves, which is usually at around 24 months of age.
Lamb - there is no different between gender. Only when they are adults is there a difference.
Young cows are typically referred to as heifers. However, if they are still nursing from their mommas, they are also called calves; more specifically heifer calves.
No. Heifer calves only have four little nipples/teats where the udder will be after they have their first calf. Heifer calves, when the do become mothers themselves, are no longer considered heifer calves, or a calf at all, but rather a cow or a first-calf heifer. Their udder typically begins to form during the last trimester of pregnancy (if a heifer does indeed get settled after reaching puberty), and will become swollen with milk once her first calf arrives, making her ready and able to give milk after giving birth.
A heifer grows into a cow that produces milk and becomes a mom to new calves which grow themselves and start to create a population. Of course she cannot do this by herself without a bull!
Bull calves are altered or castrated, at which time they are called steers. Steering a bull prevents fighting, accidental breeding with cows and heifer calves, and allows for easier management.