Oh they'll accept him as part of the herd, sure, but they won't let him mate with them.
Sometimes, if her pheromones are producing more estrogen than usual. But most pregnant cows won't have anything to do with a bull.
Only if the cow that they're mounting is in heat.
A bull calf is male with male reproductive organs, which means he cannot get pregnant. Only females (heifers, possibly heifer calves and cows) can get pregnant. Thus, your question has no merit whatsoever.
Only if she's in heat and is desperate for a bull to settle her. Otherwise, if she's not in heat or pregnant, she will not be actively looking for or trying to attract a bull to breed with her.
Cows can get pregnant through the process of mating with a bull, where the bull inseminates the cow. This can happen naturally through natural mating or artificially through artificial insemination by a qualified professional.
The bull
No. Cows need a bull to reproduce.
Cows = kine ...and that's no bull.
This is usually the bull's job. When a bull is not present, it's up to the farmer to hire an AI tech to get his cows bred, if the farmer doesn't have the expertise him/herself to AI his/her cows.
The opposite of bulls are cows or heifers. Bulls are male, cows are female. The difference between a heifer and a cow is that a cow has been pregnant.
It is important that you do not over work the bull, usually in a period of 8 hours about 3-5 is a good number for older bulls. For a better understanding, the ideal bull to cow ratio would be for yearling bulls 15-20 cows. 2 year old bulls 20-30 cows; and for 3 year old or older 30-40. This ratio is usually for pasture breeding, when the cows and bull are turned out for the summer months when the bull will then breed them as they cycle.
The Feminine or the female species of a bull is a cow.