Cow Heat Cycle?

Answer

The heat cycle for a cow last for 21 days long, but can be as short as 18 days. And this is the time when the cow is in' standing heat' and will stand with all 4 legs.
Reference:
Q&A Related to "Cow Heat Cycle?"
Females (being cows and heifers) have heat cycles once every ~21 days. The heat period itself lasts for 24 hours.
http://wiki.answers.com/Q/How+often+do+cattle+come...
The heat cycle for the cow is approximately 21 days in length (range 18 to 24 days). A number of
http://www.chacha.com/question/what-is-the-heat-cy...
A dog comes into heat about every 6 months and this cycle usually lasts about 3 weeks. It's a good idea to either breed your dog or get it spayed if you don't want puppies. Not to
http://answers.ask.com/Science/Nature/how_long_is_...
in dairy cattle, signs of oestrus only last for approx 8-12h and a new cycle begins about every 21 days. there are variations between individual cattle. Source(s) vet student.
http://answers.yahoo.com/question/index?qid=201011...
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