This really depends on the cow. Often it is the one that is being ridden that is in heat, however the one that is in heat can also ride other cows (and even the bull). The one that is in heat is the one that stands to be mounted and doesn't try to turn around and butt the other cow that had just ridden her.
Observed heat is when a farmer can see from a distance that the cow or heifer is in heat. One example is of a female mounting another female. The cow mounting is just entering heat, and if the cow it is mounting is standing still and not too fussed about what is going on then it is likely she's in standing heat. Restlessness is another sign of heat. One very cool method that has been invented for detecting cattle in heat is a little sticker that's placed on the cow just above their tail, on their back. If another cow tries to mount them and they stand still long enough for that cow to rub the sticker on their back, it turns red. The farmer can then see which cows have red stickers and which cows have stickers that haven't turned red. Another method of detecting heat in cattle is having a gomer bull or steer in with the herd. This gomer bull will be mounting and chasing those females that are in heat, either going in heat or at standing heat. Simply watching a gomer bull or steer is enough to note which females are in heat and which are not.
Heifers will show their first heat around the age of one year, depending on the heifer.
Just about everyone at one point or another.
Yes. A barren cow (one that is open, or not pregnant) is able to come into heat or estrus.
First of all, let's do the math here. One year has 365 days, and the average estrous period of a cow is 21 days. So to find how many times a cow will go into heat in one year is 365/21 = 17 days. Thus, a cow (if not bred during that year) will go into heat 17 times in one year.
This would only be done through the use of artificial insemination, and for an entire cow herd, not just one lonely cow. One cow will be bred to one sire, another couple cows will be bred to another sire, etc.
Mount, Steed.
Convective heat
Only once is necessary to get her settled. However, during a heat period, one cow can be bred to multiple bulls (if there are that many) more than once during her heat period.
a heat mover is a device that transfers heat from one object to another.
Heat transfers through: Conduction=Transfers heat from one object to another ex:the hot frying pan is touched by you and you can feel the heat Convection=transfers heat in air
it transfers from heat flow