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Stacking low birth weight genetics
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<blockquote data-quote="Son of Butch" data-source="post: 1545288" data-attributes="member: 14585"><p>Different breeds have different lengths of gestation. </p><p></p><p>Journal of Animal Science.</p><p>In 1920 283 days was considered to be the average length of gestation for all breeds of cattle.</p><p>1937 study of 27,810 gestations found the average for all breeds to be 282.1 days.</p><p>1943 study found Herefords mated to Herefords had an average gestation of 289 days and Black Angus mated to </p><p>Black Angus averaged 272.8 days. When Angus and Herefords were crossed the cows averaged 281.4 days.</p><p>Conclusion: gestation length is a heritable variation.</p><p></p><p>Since 1943 average Angus gestation length has increased at a rate of about 1 day per decade to current average of</p><p>280 days along with the increased gestation length has come an increase in average birth weight for Angus cattle.</p><p>Conclusion: birth weight and gestation length are heritable variations with a reciprocal relationship.</p></blockquote><p></p>
[QUOTE="Son of Butch, post: 1545288, member: 14585"] Different breeds have different lengths of gestation. Journal of Animal Science. In 1920 283 days was considered to be the average length of gestation for all breeds of cattle. 1937 study of 27,810 gestations found the average for all breeds to be 282.1 days. 1943 study found Herefords mated to Herefords had an average gestation of 289 days and Black Angus mated to Black Angus averaged 272.8 days. When Angus and Herefords were crossed the cows averaged 281.4 days. Conclusion: gestation length is a heritable variation. Since 1943 average Angus gestation length has increased at a rate of about 1 day per decade to current average of 280 days along with the increased gestation length has come an increase in average birth weight for Angus cattle. Conclusion: birth weight and gestation length are heritable variations with a reciprocal relationship. [/QUOTE]
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