There is a fully detailed article that answers this question in full which can be read in the related link below.
Basically, though, a cow is artificially inseminated by a person having one arm up the cow's rectum to hold the cervix through the colon wall and the other arm manipulating an AI gun with a semen straw in it through that cervix into the cow's uterus. Once the tip of the gun is in the cow's uterus, semen is deposited into her.
A cow can only be successfully AI'd if she was recently in heat. Otherwise she will not take nor get pregnant. Use of artificial hormones can help a producer synchronize several cow's heat cycles so that they can be AI'd all together in one day.
Put her with a bull or get her artificially inseminated.
A producer should have at least 25 to 50 cows to want to consider owning a bull. A cow herd that is much smaller than that should be bred by a leased bull from a neighbor or breeder that is not too far away, or artificially inseminated.
The gestation for a cow that's been AI'd would have the same gestation period as a cow that has been naturally bred: around 285 days, plus or minus. Artificial Insemination does NOT affect the length of gestation of a cow, it only affects what her offspring is going to be.
Twelve cows can be called a flink, a dozen head or a herd of cows.
Cows were not invented.
Out in the pasture or corrals if the farmer or producer uses a bull, or in the AI box or a head gate in a barn if they are going to be artificially inseminated.
Put her with a bull or get her artificially inseminated.
A lesbian can be artificially inseminated with sperm from a chosen sperm donor.
There are dairy bulls. If the cow is not bred, she will not produce milk. Bulls are necessary to do this. Although, many cows are now artificially inseminated. Unless dairy heifers are needed to increase the herd or to replace cows that are too old, any bull's semen will do.
Most people have their English Bulldogs artificially inseminated.
A producer should have at least 25 to 50 cows to want to consider owning a bull. A cow herd that is much smaller than that should be bred by a leased bull from a neighbor or breeder that is not too far away, or artificially inseminated.
The embryo is formed when the sperm from a bull attaches itself to the egg or ovum of the cow. The embryo is formed not only from the cow being bred naturally, but also when she is artificially inseminated.
You mean ARTIFICIALLY INSEMINATED ? (A correct question is the best way to get a correct answer)
Today, modern dairy cows are bred specifically to produce large quantities of milk. Like humans, cows only produce milk after they have given birth, and dairy cows must give birth to one calf per year in order to continue producing milk. Typically they are artificially inseminated within three months of giving birth.
A bred cow is just a shorter word for a cow that is pregnant, or one that has not returned to her normal cycling ~21 days after getting inseminated naturally or artificially, no matter if she has been confirmed pregnant by rectal palpation, ultrasound, blood tests or an ELIZA test. Bred cows are also called brood cows.
They do not come in heat and they gain weight
Not necessarily. Cows produce milk to feed their calf. They're artificially inseminated to make them pregnant, and thus they produce the milk upto, and after the birth. Whatever food they eat - whether that's naturally-grown grass, or artificially produced feeds - gives them the energy, vitamins and minerals they need to produce the milk.