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Last updated: August 2006 Summary: AIM: Accurate and thorough detection of cows on heat - essential for the successful use of artificial breeding. The time when a cow is on heat (in oestrus) is defined as the period during which a cow will stand to be ridden by her herd mates or a bull. It occurs every 18-24 days in non-pregnant cows and lasts on average 14-15 hours. This time can vary from 2-30 hours. View full Farmfact:
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