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<blockquote data-quote="KNERSIE" data-source="post: 267333" data-attributes="member: 4353"><p>Alan,</p><p></p><p>According to Jim Lent's book no animal should contain more than 50% influence from a certain parent. Which according to him is the natural relationship between child and parent...even in us humans... you carry half the influence from your father and half from your mother.</p><p></p><p>If you mate half brothers and -sisters you still will be at 50% influence from a single parent which is still equal to the natural relationship. Jim Lents refers to this as an animal carrying 50% of the blood of the common ancestor. (not talking about CIB now)</p><p></p><p>As far as a practical example goes:</p><p>Select a top sire which already possesses the characteristics you want in your herd. Remembering that new genes can't be created, only existing ones can be concentrated.</p><p></p><p>Now breed this bull a number of cows. Keep the best resulting bull calf (one with no visible flaws) and breed him to the best of his half sisters.(culling EVERYONE with visible faults) in the meanwhile keep breeding the original cows to the original bull if you were satisfied with the offspring...if you were not then there would have been no point in linebreeding to him.</p><p></p><p>Again keep the best bull calf from the 2nd generation matings(if he is any better than the previous one..he should be if your selections were up to standard) And breed him to his half sisters and so forth...and selecting the best bull calf/calves from each generation of linebred offspring. It is always wise to start with enough quality females in the first place and maybe more than one related bull just to keep your options open.</p><p></p><p>you continue using a bull untill he has produce a son better than himself, which would then in turn replace his father. This process can continue indefinately without ever breeding a sire to a daughter or to a granddaughter while still continuing the linebreeding program.</p><p></p><p>The success of such a program will be decided of the quality of the original common ancestor(usually the bull) and your ability to select the best offspring. And I emphasize again that EVERY calf with ANY visible fault in EVERY generation should be culled ruthlessly in order to achieve the goal of a pure strain of superior cattle.</p><p></p><p>That is why I said in my previous post that the inexperienced breeder should rather just use linebred bulls to get a more uniform calf crop from their existing cows.</p><p></p><p>PM me if you have anymore questions</p></blockquote><p></p>
[QUOTE="KNERSIE, post: 267333, member: 4353"] Alan, According to Jim Lent's book no animal should contain more than 50% influence from a certain parent. Which according to him is the natural relationship between child and parent...even in us humans... you carry half the influence from your father and half from your mother. If you mate half brothers and -sisters you still will be at 50% influence from a single parent which is still equal to the natural relationship. Jim Lents refers to this as an animal carrying 50% of the blood of the common ancestor. (not talking about CIB now) As far as a practical example goes: Select a top sire which already possesses the characteristics you want in your herd. Remembering that new genes can't be created, only existing ones can be concentrated. Now breed this bull a number of cows. Keep the best resulting bull calf (one with no visible flaws) and breed him to the best of his half sisters.(culling EVERYONE with visible faults) in the meanwhile keep breeding the original cows to the original bull if you were satisfied with the offspring...if you were not then there would have been no point in linebreeding to him. Again keep the best bull calf from the 2nd generation matings(if he is any better than the previous one..he should be if your selections were up to standard) And breed him to his half sisters and so forth...and selecting the best bull calf/calves from each generation of linebred offspring. It is always wise to start with enough quality females in the first place and maybe more than one related bull just to keep your options open. you continue using a bull untill he has produce a son better than himself, which would then in turn replace his father. This process can continue indefinately without ever breeding a sire to a daughter or to a granddaughter while still continuing the linebreeding program. The success of such a program will be decided of the quality of the original common ancestor(usually the bull) and your ability to select the best offspring. And I emphasize again that EVERY calf with ANY visible fault in EVERY generation should be culled ruthlessly in order to achieve the goal of a pure strain of superior cattle. That is why I said in my previous post that the inexperienced breeder should rather just use linebred bulls to get a more uniform calf crop from their existing cows. PM me if you have anymore questions [/QUOTE]
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