Not usually, no. If she is having more than one "false" heat, chances are it's not false at all. She probably absorbed the embryo or aborted early and came back to heat soon after.
A false heat is when a cow goes in heat or estrus but doesn't ovulate. False heats may occur when a female is pregnant, and are not common either.
Yes.
Yes. A bull will mate with a cow more than once during her heat cycle if he is so inclined and if he has few other cows to mate with.
This is false. Bulls are more able to identify a cow in heat by pheromones excreted in her urine, and by her actions of trying to mount other cows, but mostly be other cows mounting her. Bulls "taste" her urine and do a flehman response by curling back is upper lip to smell if she is in heat or not or close to standing heat. A cow in heat can carry pheromones to a bull on the breeze as well, which goes to show you what farmers say when a "bull can smell a cow in heat for miles" is more true than the changes in frequency and pitch in her bellering.
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.
Typically a lactating cow will eat 50% more than a dry cow would. As for energy needs, a lactating cow needs around 15% more energy than dry cows do.
One possibility is that she may have experienced a false heat, but this usually only occurs if she's earlier on in her gestation than in late gestation. Other possibilities are more worrying and such that you must contact your veterinarian about to see what could be wrong.
the cow because it poohs more than chickens.
Bulls may mount her, however, there is not an egg present so she will not catch or become pregnant.
Hopefully only once. A healthy cow should be able to be settled on only one breeding session to conceive a calf. If there are more than one bull present and she is in heat, she will most likely get bred by more than one bull.
No. Cow's milk have more calcium than almond milk.
Estrogen is the hormone that induces estrus, or the heat period where a cow is susceptible or ready to be bred by a bull. The cow acts more vigorously during her heat period than when she's not in heat, mooing a lot, pacing the fence-line, inducing other females to mount her, or encouraging the bull to follow her and attempt to mount her. She tends to be more focused on finding a mate than on eating or sitting down and relaxing, and may go off feed temporarily during estrus.