Without the influence of humans, (as in diary farming) how often are cows pregnant?

Question

I am trying to figure out whether being pregnant every 12-14 months, as in dairy farming, is what would naturally occur anyway during a cow's life cycle.

Answer 1

A cow should conceive once per year so its natural

Answer 2

hi dear..

Pregnancy rates for embryos transferred from early postpartum beef cows into recipients with normal estrous cycles

FN Schrick, EK Inskeep and RL Butcher

Division of Animal and Veterinary Sciences, West Virginia University, Morgantown 26506-6108.

Survival rate of embryos from first ovulations of postpartum cows with SHORT (6.9 +/- 0.3 days; n = 35) or NORMAL (17.1 +/- 0.3 days; n = 42) luteal phases and quality of the embryos on Day 6 were compared. At 19 to 23 days postpartum, cows were allotted to receive a norgestomet implant for 9 days (normal luteal phase) or to serve as untreated controls (short luteal phase). Calves were weaned 7 days after initiation of treatment to induce behavioral estrus in cows for mating. In 25 cows, growth of the ovulatory follicle was monitored by ultrasonography. On Day 6 after estrus, embryos were recovered nonsurgically, and live embryos were transferred into recipient cows exhibiting normal estrous cycles. The medium used to flush the embryos from the uterus of each donor cow was assayed for prostaglandin F2 alpha (PGF2 alpha). Days from calf removal to estrus and size of ovulatory follicles at ovulation (4.1 +/- 0.3 days and 16.7 +/- 0.7 mm, respectively) did not differ between NORMAL and SHORT cows. Interval from detection of the ovulatory follicle to ovulation was longer in NORMAL (10 +/- 0.7 days) than in SHORT cows (8 +/- 0.6 days; p < 0.05). Rates of recovery of an embryo or ovum (64%), rates of fertilization (65%), and quality or stage of development of Day 6 embryos did not differ between SHORT and NORMAL cows. Overall pregnancy rate from recovered oocytes was 13% for SHORT and 32% for NORMAL cows (p = 0.06); survival of fertilized oocytes was 23% for SHORT and 47% for NORMAL cows (p = 0.08).(ABSTRACT TRUNCATED AT 250 WORDS)

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Answer 3

The natural cycle of bovine is in fact very similar to that of bison. There is a natural one year cycle. 9 months of gestation followed by birth of the calf and then subsequent mating with a bull over the remainder of the year. This is very common but is not 100% as other factors may preclude pregnancy.

Answer 4

once cows become pregnant they carry a calf for usually 9 months, 9 days (thats the average) and after they freshen the ideal cow will become pregnant again within 1-4 months, assuming that they are with a bull

Answer 5

Beef cows on the range tend to have calves in spring or very late winter.

Cows that have calves too late will have calves going into winter too small. Cows that calve much earlier risk losing their calf shortly after birth.

So there appears to be a natural reason for an annual cycle.

But where there is no severe winter, there may be other benefits for calving at a particular time of year. Cuban cows do not however appear to be strongly dedicated to any given time of year.