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<blockquote data-quote="KNERSIE" data-source="post: 391917" data-attributes="member: 4353"><p>Linebreeding can be a very good tool, if used correctly, but the answer to your question isn't a simple one. </p><p></p><p>Firstly you need to have a 100% clear picture of exactly what you want to breed as far as phenotype and performance go. If you aren't 100% sure what your ideal looks like don't even try to linebreed. </p><p></p><p>Then do a thorough study of how genetics and heritibility, especially of the economically important traits work. </p><p></p><p>Then you need to really research your breed of choice, as far back as there is records, and identify prominent lines and how they were created. Now you need to identify bulls that approximates your ideal. Start with more than one as you are likely to find problems in some of them in the future. </p><p></p><p>Now its back to research, go as far back as possible on every bull you've identified, see as many realtives, try and find out weaknesses and strengths.</p><p></p><p>Now you still haven't identified cows to use these sires on, try and select cows that are stronger in the areas the bulls can be improved on. From then the operative word is CULL, CULL and CULL some more!</p><p></p><p>What I am trying to say is that there is more to linebreeding than just make incestuous matings. If you haven't at the very least gone through all the steps I mentioned your chance of success is very limited. If you have gone through all the steps you'd probably not need to ask the questions you've asked.</p><p></p><p>How far you can push it will be determined entirely by how well you've planned your matings, how much research has gone into it and most importantly how well you have selected and culled in the process. Its a matter of working towards your idea of perfection and not simply how far I can push my luck.</p></blockquote><p></p>
[QUOTE="KNERSIE, post: 391917, member: 4353"] Linebreeding can be a very good tool, if used correctly, but the answer to your question isn't a simple one. Firstly you need to have a 100% clear picture of exactly what you want to breed as far as phenotype and performance go. If you aren't 100% sure what your ideal looks like don't even try to linebreed. Then do a thorough study of how genetics and heritibility, especially of the economically important traits work. Then you need to really research your breed of choice, as far back as there is records, and identify prominent lines and how they were created. Now you need to identify bulls that approximates your ideal. Start with more than one as you are likely to find problems in some of them in the future. Now its back to research, go as far back as possible on every bull you've identified, see as many realtives, try and find out weaknesses and strengths. Now you still haven't identified cows to use these sires on, try and select cows that are stronger in the areas the bulls can be improved on. From then the operative word is CULL, CULL and CULL some more! What I am trying to say is that there is more to linebreeding than just make incestuous matings. If you haven't at the very least gone through all the steps I mentioned your chance of success is very limited. If you have gone through all the steps you'd probably not need to ask the questions you've asked. How far you can push it will be determined entirely by how well you've planned your matings, how much research has gone into it and most importantly how well you have selected and culled in the process. Its a matter of working towards your idea of perfection and not simply how far I can push my luck. [/QUOTE]
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