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Livestock & Forage
Lambing 8 Week Weights without birth weights
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<blockquote data-quote="ringi" data-source="post: 9197017" data-attributes="member: 57632"><p>The maths in Signet type systems depends on being able to link all the lambs to their fathers as well as mothers.</p><p></p><p></p><p></p><p>There is a big difference between compering within a single management group (flock) then comparing rams by eye at a market when the rams have had different feeding.</p><p></p><p></p><p></p><p>The only real issue I have with signet indexes is they can't tell you if the resulting replacements ewes will cope with over wintering on your farm, as a ewe with a better 8 week ebv may have it at the cost of needing more winter feed due to not recovering body fat after giving lots of energy to her lambs.</p><p></p><p></p><p></p><p>Great for a fully closed flock/herd, but does not premit compared rams/bulls from different farms. Comparing by eye at a livestock market is little better then a random number generator, hence I tend to think best to use own rams/bulls unless buying based on signet data or directly from a farm (with the same system as you) you fully trust to have culled hard.</p></blockquote><p></p>
[QUOTE="ringi, post: 9197017, member: 57632"] The maths in Signet type systems depends on being able to link all the lambs to their fathers as well as mothers. There is a big difference between compering within a single management group (flock) then comparing rams by eye at a market when the rams have had different feeding. The only real issue I have with signet indexes is they can't tell you if the resulting replacements ewes will cope with over wintering on your farm, as a ewe with a better 8 week ebv may have it at the cost of needing more winter feed due to not recovering body fat after giving lots of energy to her lambs. Great for a fully closed flock/herd, but does not premit compared rams/bulls from different farms. Comparing by eye at a livestock market is little better then a random number generator, hence I tend to think best to use own rams/bulls unless buying based on signet data or directly from a farm (with the same system as you) you fully trust to have culled hard. [/QUOTE]
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Lambing 8 Week Weights without birth weights
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