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Cattle Boards
Artificial Insemination (AI) for Cattle
First time doing AI
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<blockquote data-quote="moses388" data-source="post: 1817083" data-attributes="member: 27368"><p>A cow's natural estrus cycle is 21 days, but can vary from 18 to 24 days. </p><p></p><p>A cow has a secondary heat ("mini heat") every 7 days. There is a small hormone-level increase associated with a mini heat. A cow will not breed on a mini heat. More like she is preparing for the primary heat that occurs every 21 days. So you would see 2 mini heats and then the primary heat on day 21. Two days after insemination, you want to see blood on the cow's tail. ... Say you find fresh blood on a tail. To predict the next heat, backup 2 days and then go ahead 3 weeks on a calendar. That's the next day to watch for signs of heat/estrus.</p></blockquote><p></p>
[QUOTE="moses388, post: 1817083, member: 27368"] A cow's natural estrus cycle is 21 days, but can vary from 18 to 24 days. A cow has a secondary heat ("mini heat") every 7 days. There is a small hormone-level increase associated with a mini heat. A cow will not breed on a mini heat. More like she is preparing for the primary heat that occurs every 21 days. So you would see 2 mini heats and then the primary heat on day 21. Two days after insemination, you want to see blood on the cow's tail. ... Say you find fresh blood on a tail. To predict the next heat, backup 2 days and then go ahead 3 weeks on a calendar. That's the next day to watch for signs of heat/estrus. [/QUOTE]
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