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marbling and tenderness genes
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<blockquote data-quote="OK Jeanne" data-source="post: 216509" data-attributes="member: 3333"><p>The method used to validate the tenderness testing was:</p><p></p><p>test many many animals to see if they had one copy, two</p><p>copies, or no copies of the relevant factors</p><p></p><p>then slaughter those animals</p><p></p><p>then do a shear force test on the meat</p><p></p><p>then compare the results for each animal on the shear</p><p>force test with their result on the dna test.....</p><p></p><p></p><p>so I can't see how one could argue with the validity of</p><p>the tests....this is the way MARC does it.</p><p></p><p>When there were only two factors being used(i.e. four</p><p>dna points examined)(4 "stars"), the difference in</p><p>shear force tests showed a 1.5 to 2.5 difference in</p><p>the force required when comparing zero "star" animals</p><p>to 4 "star" animals. IMO a shear force test is the only</p><p>statistical way the dna locations on the genome could</p><p>be proven.</p><p></p><p>Personally, I have noticed that the more people are </p><p>emotionally and financially wedded to the EPD system,</p><p>the more they ignore any other scientific method</p><p>that comes along....YMMV.</p><p></p><p>When you say that tenderness is not important to beef</p><p>producers, I think you mean that it is not important</p><p>to those beef producers in the commercial system set</p><p>up for feedlot production. Tenderness is the most</p><p>important factor for producers that direct-market, IMO.</p><p></p><p>I would suspect that the expert you are quoting might</p><p>be saying that the presently discovered DNA factors</p><p>for tenderness likely only represent 6% of the potential</p><p>(as yet undiscovered) factors that are present in the</p><p>genome. It's hard to see how someone could argue</p><p>against MARC's system of shear force testing.</p></blockquote><p></p>
[QUOTE="OK Jeanne, post: 216509, member: 3333"] The method used to validate the tenderness testing was: test many many animals to see if they had one copy, two copies, or no copies of the relevant factors then slaughter those animals then do a shear force test on the meat then compare the results for each animal on the shear force test with their result on the dna test..... so I can't see how one could argue with the validity of the tests....this is the way MARC does it. When there were only two factors being used(i.e. four dna points examined)(4 "stars"), the difference in shear force tests showed a 1.5 to 2.5 difference in the force required when comparing zero "star" animals to 4 "star" animals. IMO a shear force test is the only statistical way the dna locations on the genome could be proven. Personally, I have noticed that the more people are emotionally and financially wedded to the EPD system, the more they ignore any other scientific method that comes along....YMMV. When you say that tenderness is not important to beef producers, I think you mean that it is not important to those beef producers in the commercial system set up for feedlot production. Tenderness is the most important factor for producers that direct-market, IMO. I would suspect that the expert you are quoting might be saying that the presently discovered DNA factors for tenderness likely only represent 6% of the potential (as yet undiscovered) factors that are present in the genome. It's hard to see how someone could argue against MARC's system of shear force testing. [/QUOTE]
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