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How Much Is Too Much?
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<blockquote data-quote="VLS_GUY" data-source="post: 743226" data-attributes="member: 13182"><p>This not the first time MARC has come out with findings like this. I have also seen results that sat char cross cows are the most fertile for example. These results reflect the limitations of the MARC demonstration herds than anything else. I talked to Larry Cundiff about these findings and some limitations should have been part of the article. The MARC data is taken from limited numbers of each breed and in no way can represent all the variation or even the mean performance level in any trait for an entire breed. Even more importantly the bulls MARC uses are from the 50 most popular bulls used in AI from the previous year for each breed. What this means is that the bulls that MARC uses are seen through the lens of ABS, GENEX, Select Sires etc. Generally the Charolais and Simmental bulls selected by commercial AI studs tend to be of the easier calving and maternal side of things. They are also slower growing and have smaller mature weights. With very few notable exceptions I can buy higher growth and better carcass Charolais or Simmental bulls from a good bull sale than are available from any commercial AI stud. Also the 50 most popular bulls in any breed will reflect the aspirations the breeders have for improvement; for Charolais breeders this always was calving ease and maternal traits, for Angus growth and carcass traits were and still are very important point to improve.</p><p>So take these results with a grain of salt.</p></blockquote><p></p>
[QUOTE="VLS_GUY, post: 743226, member: 13182"] This not the first time MARC has come out with findings like this. I have also seen results that sat char cross cows are the most fertile for example. These results reflect the limitations of the MARC demonstration herds than anything else. I talked to Larry Cundiff about these findings and some limitations should have been part of the article. The MARC data is taken from limited numbers of each breed and in no way can represent all the variation or even the mean performance level in any trait for an entire breed. Even more importantly the bulls MARC uses are from the 50 most popular bulls used in AI from the previous year for each breed. What this means is that the bulls that MARC uses are seen through the lens of ABS, GENEX, Select Sires etc. Generally the Charolais and Simmental bulls selected by commercial AI studs tend to be of the easier calving and maternal side of things. They are also slower growing and have smaller mature weights. With very few notable exceptions I can buy higher growth and better carcass Charolais or Simmental bulls from a good bull sale than are available from any commercial AI stud. Also the 50 most popular bulls in any breed will reflect the aspirations the breeders have for improvement; for Charolais breeders this always was calving ease and maternal traits, for Angus growth and carcass traits were and still are very important point to improve. So take these results with a grain of salt. [/QUOTE]
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