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Breeding / Calving Issues
Synching and gender
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<blockquote data-quote="whitecow" data-source="post: 817580" data-attributes="member: 8638"><p>Centrifugation doesn't work very well. This is the method currently used by all of the AI studs....</p><p></p><p><a href="http://www.sexingtechnologies.com/articles/technique" target="_blank">http://www.sexingtechnologies.com/articles/technique</a></p><p></p><p>There is some evidence that male sperm swim slower than female, but it would take a VERY large study to show a statistical difference in the number bulls vs heifers based on insemination timing. There are still lots of variables like semen quality, capacitation, when ovulation actually occurs. I've heard lots of anecdotal evidence that timing of insemination affects gender ratios, but I haven't seen any well-controlled studies that show significant, repeatable results.</p></blockquote><p></p>
[QUOTE="whitecow, post: 817580, member: 8638"] Centrifugation doesn't work very well. This is the method currently used by all of the AI studs.... [url=http://www.sexingtechnologies.com/articles/technique]http://www.sexingtechnologies.com/articles/technique[/url] There is some evidence that male sperm swim slower than female, but it would take a VERY large study to show a statistical difference in the number bulls vs heifers based on insemination timing. There are still lots of variables like semen quality, capacitation, when ovulation actually occurs. I've heard lots of anecdotal evidence that timing of insemination affects gender ratios, but I haven't seen any well-controlled studies that show significant, repeatable results. [/QUOTE]
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