7.5 months of gestation? She shouldn't. This is what is called Premature Birth, and often, if the calf is not cared for very well, the calf will not survive. A calf's lungs will be underdeveloped, and he will also be very susceptible to fluctuations in temperature and diseases, so care really has to be taken (even if it means taking it in the house for a few weeks), to keep it warm, well fed, and healthy.
calve
A Calve, or Calf
Plenty. "Cow have calf" is not a proper sentence, it's referred to as an "incomplete sentence." To form a proper sentence using these words give you something like this:"A cow will have a calf.""A cow is going to have a calf.""The cow will have a calf.""The cow is going to have a calf."And so on and so forth.
That really depends on when she was bred. The average gestation period of a cow (or heifer) is around 285 days. Thus, if a heifer was bred when she was 15 months old, then she would likely give birth by the time she is 24 months of age. If she was bred when she was 18 or 20 months old, then she would calve out when she's 27 to 29 months of age.
Once a year.
Springer.
It is, but it is very rare.
That all depends on when they have been bred. A heifer bred at 15 months of age would calve when she's 24 months old. If she's bred later than that, she will always calve 9 months later.
Generally, a few hours.
Yes. A cow has a gestation period of around 9 months (~285 days) and has a two to three month rest before being bred again, in which she will calve again at around the same time the following year.
A cow will start to develop milk secretion cells about 6 months into pregnancy, however, she will start to let her milk down into the milk cisterns and into the teats about two days before she is ready to calve.
The best time to let the bull in with the cow and calf is around 60 days after the cow gave birth. That is the time she will be receptive and ready to conceive another calf. You can keep the bull in with her and her calf until she is about to calve again, which will be in a 9 months and a couple weeks.