False heats are rare in cows or heifers that are already bred. If a heifer does go into heat when pregnant, it only occurs once or twice and that's it. But normally, no, a heifer won't still mate when she's pregnant.
No, a pregnant rabbit will not mate. Once a rabbit is pregnant, it will not engage in mating behavior.
No.
Yes.
A heifer is a female bovine that has not yet had its first calf. A long bred heifer is a heifer well along in the gestation period and due to calve shortly.
Whenever a cow or heifer is sexually receptive.
yes in order for your dog to get pregnant she will have to mate a couple times
A heifer. If she's pregnant she's called a bred heifer.
An "open" heifer is one that is of breeding age, and able to be bred. A "fresh" heifer is one that has recently given birth. A pregnant heifer is, well, pregnant (that's easy). A springing heifer is one who is nearing the end of her pregnancy, within a few weeks of giving birth. "Dry" is not milking and pregnant. "Close" would indicate 240 days pregnant or more. Note that the term has regional variations on the subtleties of it's meaning; so it's best to use it in the general sense only. For example, in many places "open" just means "not pregnant" and doesn't imply that she's ready to be bred.
My colts will try to mate with the fence, goats, even me. It is what they do. Gelding time is here!
A zebu heifer will often be 24 months of age before she reaches puberty.
It depends on you and what your plans are for the female and her calf and your experience with calving females. Often bred heifers are cheaper than bred cows, but they can be a pain in the rear when it comes down to calving, because they're predictably unpredictable. A bred cow will have more experience delivering and mothering up to a calf than a heifer will, and if you intend on keeping the calf for breeding (IF it's a heifer), then more often than not, if the cow's a good dam, the calf will be a good keeper. Not so for heifers: any calf that they birth should be raised for slaughter or sold, as they're not as good quality to keep for breeding purposes as her second, third, fourth, etc. calves will be. So it's all up to you.
Yes. "Barren" is just another word for open, or not pregnant.