I heard that on the National G channel.? They were talking about humans, not animals, so I don't know about dogs.?? I do know that we can breed a bitch to two different studs and get pups from both studs.? Our vet has done a surgical implants using semen from two different studs and the litters were split between both studs.? I have also done a dual sire breeding where all pups were the second male's pups. It seems to me, if the sperm were going to battle it out, why would the vet use both males at the same time?? I will ask my repro vet about this. B Hively -----Original Message----- From: Edwin Hill <edwinx@xxxxxxxxxxxxx> To: freelist <showgsd-l@xxxxxxxxxxxxx> Sent: Sat, Jul 11, 2009 11:49 am Subject: [ SHOWGSD-L ] Breeding to TWO studs ...I read an article somewhere several years ago that many male animals including dogs have "fighter sperms"...the job of these fighter sperms is to kill the sperm of any other male that try to impregnate the female.....I really read this!...any one out there have any info to confirm or debunk this?.....I can think out lots of "David Letterman like" comments about this, but I'd better keep them to myself...lol...FB ============================================================================ POST is Copyrighted 2008. All material remains the property of the original author and of GSD Communication, Inc. NO REPRODUCTIONS or FORWARDS of any kind are permitted without prior permission of the original author AND of the Showgsd-l Management. ALL RIGHTS RESERVED. ALL PERSONS ARE ON NOTICE THAT THE FORWARDING, REPRODUCTION OR USE IN ANY MANNER OF ANY MATERIAL WHICH APPEARS ON SHOWGSD-L WITHOUT THE EXPRESS PERMISSION OF ALL PARTIES TO THE POST AND THE LIST MANAGEMENT IS EXPRESSLY FORBIDDEN, AND IS A VIOLATION OF LAW. VIOLATORS OF THIS PROHIBITION WILL BE PROSECUTED. For assistance, please contact the List Management at admin@xxxxxxxxxxxx VISIT OUR WEBSITE - http://showgsd.org NATIONAL BLOG - http://gsdnational.blogspot.com/ ============================================================================ gsd ============================================================================ POST is Copyrighted 2008. All material remains the property of the original author and of GSD Communication, Inc. NO REPRODUCTIONS or FORWARDS of any kind are permitted without prior permission of the original author AND of the Showgsd-l Management. ALL RIGHTS RESERVED. ALL PERSONS ARE ON NOTICE THAT THE FORWARDING, REPRODUCTION OR USE IN ANY MANNER OF ANY MATERIAL WHICH APPEARS ON SHOWGSD-L WITHOUT THE EXPRESS PERMISSION OF ALL PARTIES TO THE POST AND THE LIST MANAGEMENT IS EXPRESSLY FORBIDDEN, AND IS A VIOLATION OF LAW. VIOLATORS OF THIS PROHIBITION WILL BE PROSECUTED. For assistance, please contact the List Management at admin@xxxxxxxxxxxx VISIT OUR WEBSITE - http://showgsd.org NATIONAL BLOG - http://gsdnational.blogspot.com/ ============================================================================