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<blockquote data-quote="Jeanne - Simme Valley" data-source="post: 363663" data-attributes="member: 968"><p>Twinning is "mostly" the outcome of high fertility - pretty much on both the cow & the bull. The cow, because she produces more eggs, the bull because he has high sperm count. Of course there's the identical twin, which is a function of the cow (I think).</p><p>I think cows that have identical twins might be more likely to pass this "trait" to her offspring. But twinning is lowly heritable. Think it was ABS that purposely developed bulls for twinning - breeding twin bulls to twin cows. There were able to increase the twinning incidence.</p><p>Nutrition has a lot to do with it also. A cow that is thin at BREEDING would rarely produce extra eggs. There are always exceptions. But fertility is highly affected by nutrition.</p><p>"Supposedly" Simmentals twin 13% & other beef breeds are at 8% - but those are OLD figures I was told many moons ago <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="Jeanne - Simme Valley, post: 363663, member: 968"] Twinning is "mostly" the outcome of high fertility - pretty much on both the cow & the bull. The cow, because she produces more eggs, the bull because he has high sperm count. Of course there's the identical twin, which is a function of the cow (I think). I think cows that have identical twins might be more likely to pass this "trait" to her offspring. But twinning is lowly heritable. Think it was ABS that purposely developed bulls for twinning - breeding twin bulls to twin cows. There were able to increase the twinning incidence. Nutrition has a lot to do with it also. A cow that is thin at BREEDING would rarely produce extra eggs. There are always exceptions. But fertility is highly affected by nutrition. "Supposedly" Simmentals twin 13% & other beef breeds are at 8% - but those are OLD figures I was told many moons ago :D [/QUOTE]
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