It's called a steer.
A male horse castrated before reaching sexual maturity is called a gelding. A male horse that is sexually mature is called a stallion.
When castrated he will be called a steer no matter how young.
"Bovine" refers to cows in general. A male cow which has been castrated is called an ox. The plural of ox is oxen.
They are generally known as bulls, which are intact males used to breed cows and heifers. Steers (being castrated males) don't exactly mature, as they may keep growing even after the age of maturity for both bulls and cows, though more slower than when they were young.
A castrated ram is a ram that has had his testicles removed, also known as a wether.
A male horse castrated before reaching sexual maturity is called a gelding. A male horse that is sexually mature is called a stallion.
When castrated he will be called a steer no matter how young.
Bullock.
"Bovine" refers to cows in general. A male cow which has been castrated is called an ox. The plural of ox is oxen.
A steer if referring to a castrated bovine raised for beef, or an ox if referring to a castrated, usually horned bovine used for draft.
Dairy males are called bulls if intact and steers if castrated.
They are generally known as bulls, which are intact males used to breed cows and heifers. Steers (being castrated males) don't exactly mature, as they may keep growing even after the age of maturity for both bulls and cows, though more slower than when they were young.
A castrated ram is a ram that has had his testicles removed, also known as a wether.
"Male cows" castrated before reaching sexual maturity are called steers.
Assuming you mean "teenage" in a figurative sense... An immature pig is generally called a shoat or piglet. An unbred female pig is called a gilt. (There's not a corresponding term for an unbred male pig, though a male pig castrated before puberty is called a barrow and one castrated after puberty is a stag.) If you meant it literally, then a pig of 13-19 years of age would be called a boar or hog if male, or a sow if female.
If she's a female bovine that has had at least two calves, then she should be called a cow. If this "cow" is anything BUT the definition above, "she" would be a heifer (a female bovine that has had zero to 1 calf), a steer (a castrated male bovine), or a bull (an intact [has testes] male bovine that is used for breeding).
There is no such thing as a female bullock. A bullock is another name for a steer, and even so there is no such thing as a female steer. However, a female unsexed bovine is called a spayed heifer.