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<blockquote data-quote="Lucky_P" data-source="post: 1720908" data-attributes="member: 12607"><p>Not that I'd wanna go there, but the USMeatAnimalResearchCenter, at Clay Center, Nebraska developed a line of 'twinner' cattle - a composite 'breed' ( I know there were Simmental, Pinzgauer, Angus, and several other breeds in the mix)... ABS even offered a couple of the Twinner bulls, back in the 1980s. Daughters of these bulls had a much higher incidence of twinning, compared to the general cattle population... we're talking a 60% twinning rate in the 'Twinner' herd, compared to ~ 2% in the general population. Several years back, USMARC was still selling some of their Twinner bulls, cows, and semen in their yearly auction. </p><p></p><p>Google search brought up this: <a href="https://www.twinnercattle.com/" target="_blank">https://www.twinnercattle.com/</a></p><p></p><p>While there is the possibility of XX(female) germ cells being present in testicles of bull calves born twin to a freemartin, studies have show no evidence of decreased fertility in these bulls, and no increased percentage of female offspring. </p><p>Testosterone produced by the male twin's testicles overrides development of the female twin's ovaries and reproductive tract... so, there is little to no estrogen produced that might hinder testicular development in utero.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1720908, member: 12607"] Not that I'd wanna go there, but the USMeatAnimalResearchCenter, at Clay Center, Nebraska developed a line of 'twinner' cattle - a composite 'breed' ( I know there were Simmental, Pinzgauer, Angus, and several other breeds in the mix)... ABS even offered a couple of the Twinner bulls, back in the 1980s. Daughters of these bulls had a much higher incidence of twinning, compared to the general cattle population... we're talking a 60% twinning rate in the 'Twinner' herd, compared to ~ 2% in the general population. Several years back, USMARC was still selling some of their Twinner bulls, cows, and semen in their yearly auction. Google search brought up this: [URL]https://www.twinnercattle.com/[/URL] While there is the possibility of XX(female) germ cells being present in testicles of bull calves born twin to a freemartin, studies have show no evidence of decreased fertility in these bulls, and no increased percentage of female offspring. Testosterone produced by the male twin's testicles overrides development of the female twin's ovaries and reproductive tract... so, there is little to no estrogen produced that might hinder testicular development in utero. [/QUOTE]
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