A cow will come into heat every 21 days, regardless of the time of year, they will not (or at lease should not) come into heat when they are pregnant.
They can be inseminated any time of the year.
They do not come in heat and they gain weight
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.
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.
Yes.
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.
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.
the area was white. because i went back in time and inseminated thier land
VERY rarely. Cows will only calve once a year.
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.
Those cows that are consistent in milk production, calving ease, fertility, mothering ability, etc. and are able to breed on time and produce a calf every year.
Any time of the year, or any month, depending on when the cow was bred.