What advantages does gestation give a cow for survival?
Nothing really, other than the ability to protect a growing fetus for 9 months at a time, which, when born, grows to help spread her genetics to other generations.
Seven-and-a-half months of gestation is much too early for cattle. Calves born at this age are deemed premature and their chances of survival are quite slim because they are not quite fully developed. It is much better to let a cow carry a calf to full term (which is more like 9.5 months rather than 9 months exactly) than to force her to abort a calf too early and risk the calf's survival.
Cows are mature female bovines that are capable of having calves. By "having" I mean that they are able to conceive, grow and give birth to live young. Gestation is just a fancy term for pregnancy, which also means that a cow is capable of being pregnant with a calf (being the fetus) inside her. Thus, gestation has pretty much everything to do with a cow. If she cannot conceive and become pregnant with a…