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<blockquote data-quote="UG" data-source="post: 230056" data-attributes="member: 714"><p>jnowack,</p><p></p><p>Thanks for the question. I don't have time to dig through all the MARC data, but the paragraph from a Harlan Ritchie article below discusses variability from composite seedstock:</p><p></p><p></p><p>What about the variability of composites? </p><p>Research at the U.S. Meat Animal Research Center (MARC), Clay Center, NE, has shown that for economically important traits controlled by many genes (quantitative traits), the amount of variation (as measured by coefficient of variation) is similar for composites and for the contributing purebreds. However, for qualitative traits that are controlled by only a few genes (e.g., color, horns, etc.), composites may exhibit considerably more variation than purebreds, depending on the specific breeds that go into the formation of a particular composite. </p><p> </p><p> <a href="http://www.msu.edu/~ritchieh/papers/composites.html" target="_blank">http://www.msu.edu/~ritchieh/papers/composites.html</a></p><p></p><p>Please note that the last sentence mentions that composite progeny may exhibit more variation on qualitative traits controlled by only a few genes (i.e. color, horns, etc.). Within several of the more popular composites (i.e. Balancers, Brangus, SimAngus) there are many homozygous polled & homozygous black bulls to chose from.</p><p></p><p>I hope this helps.</p></blockquote><p></p>
[QUOTE="UG, post: 230056, member: 714"] jnowack, Thanks for the question. I don't have time to dig through all the MARC data, but the paragraph from a Harlan Ritchie article below discusses variability from composite seedstock: What about the variability of composites? Research at the U.S. Meat Animal Research Center (MARC), Clay Center, NE, has shown that for economically important traits controlled by many genes (quantitative traits), the amount of variation (as measured by coefficient of variation) is similar for composites and for the contributing purebreds. However, for qualitative traits that are controlled by only a few genes (e.g., color, horns, etc.), composites may exhibit considerably more variation than purebreds, depending on the specific breeds that go into the formation of a particular composite. [url=http://www.msu.edu/~ritchieh/papers/composites.html]http://www.msu.edu/~ritchieh/papers/composites.html[/url] Please note that the last sentence mentions that composite progeny may exhibit more variation on qualitative traits controlled by only a few genes (i.e. color, horns, etc.). Within several of the more popular composites (i.e. Balancers, Brangus, SimAngus) there are many homozygous polled & homozygous black bulls to chose from. I hope this helps. [/QUOTE]
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