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<blockquote data-quote="Ebenezer" data-source="post: 1385835" data-attributes="member: 24565"><p>Each genepool will respond differently so that annswer is "it depends". The 12.5% mentioned is a sustainable population but we do not know if that is the average of the population or the maximum allowed per individual. As either, it is borderline and probably would relate to the 1st cousin rule or somewhere there about. That was Lent's upper limit which he imposed upon himself. Wye probably has individuals as high as 15 or 20% but overall are low % IBC.</p><p></p><p>Linebreeding is about the population but the individuals still need evaluation to see if they are fits or outliers. It is hard to sell a highly inbred bull that is a good fit.</p><p></p><p>You will know "when" by slip of function and/or phenotype and you do not think that you can afford them anymore. There is a sag early on, according to Falloon, called the Bulmer effect. Get past it and things can rebound from an assumed failure. From historic efforts and other folks who are still linebreeding - expect 85% failure (total line depletion) of initial lines when trialed at significant inbreeding efforts.</p><p></p><p>A tight genepool is a double whammy. You work with what you start with and then realize that as in every generational interval there is genetic loss rather than genetic gain. The other things that come along are mutations, good and bad, and the stacking of recessive genes.</p></blockquote><p></p>
[QUOTE="Ebenezer, post: 1385835, member: 24565"] Each genepool will respond differently so that annswer is "it depends". The 12.5% mentioned is a sustainable population but we do not know if that is the average of the population or the maximum allowed per individual. As either, it is borderline and probably would relate to the 1st cousin rule or somewhere there about. That was Lent's upper limit which he imposed upon himself. Wye probably has individuals as high as 15 or 20% but overall are low % IBC. Linebreeding is about the population but the individuals still need evaluation to see if they are fits or outliers. It is hard to sell a highly inbred bull that is a good fit. You will know "when" by slip of function and/or phenotype and you do not think that you can afford them anymore. There is a sag early on, according to Falloon, called the Bulmer effect. Get past it and things can rebound from an assumed failure. From historic efforts and other folks who are still linebreeding - expect 85% failure (total line depletion) of initial lines when trialed at significant inbreeding efforts. A tight genepool is a double whammy. You work with what you start with and then realize that as in every generational interval there is genetic loss rather than genetic gain. The other things that come along are mutations, good and bad, and the stacking of recessive genes. [/QUOTE]
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