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<blockquote data-quote="alexfarms" data-source="post: 626819" data-attributes="member: 8677"><p>That is exactly why I do it that way......so that they are ratioed as a separate group. If all my cattle had similar inbreeding coefficients it wouldn't be necessary to ratio them separately. I think if you were doing it, you would understand why I do it this way. I copy Miles City alot, because they have been doing this stuff a long time. They were having trouble with the epds on their young cows and heifers. They studied it and determined that inbreeding deficiency affected younger mother cows more than older mother cows. I believe the AHA uses like a 60# adjustment for 2 year old dams and Miles City determined in their herd of inbreds a 100# adjustment factor should be used. As a solution Miles City began making separate contemporary groups for the 2 year olds calves. Another example they have found at Miles City is that the frame score charts don't fit the inbreds there. As the inbreds mature they climb up in the frame score charts used by the beef industry. The general conclusion is that inbreeding delays maturity. Have you ever done a sire daughter mating? A sire daughter mating would have an inbreeding coefficient of 25%. The Miles City cattle are mostly in the 30%'s and many without linebreeding showing up in the 3 generation pedigrees. Most of the inbreds I have are probably higher than the Miles City cattle in inbreeding coefficient. When the performance collecting craze started, the instruction was to group calves into as many different contemporary groups as possible in order to increase accuracy.</p></blockquote><p></p>
[QUOTE="alexfarms, post: 626819, member: 8677"] That is exactly why I do it that way......so that they are ratioed as a separate group. If all my cattle had similar inbreeding coefficients it wouldn't be necessary to ratio them separately. I think if you were doing it, you would understand why I do it this way. I copy Miles City alot, because they have been doing this stuff a long time. They were having trouble with the epds on their young cows and heifers. They studied it and determined that inbreeding deficiency affected younger mother cows more than older mother cows. I believe the AHA uses like a 60# adjustment for 2 year old dams and Miles City determined in their herd of inbreds a 100# adjustment factor should be used. As a solution Miles City began making separate contemporary groups for the 2 year olds calves. Another example they have found at Miles City is that the frame score charts don't fit the inbreds there. As the inbreds mature they climb up in the frame score charts used by the beef industry. The general conclusion is that inbreeding delays maturity. Have you ever done a sire daughter mating? A sire daughter mating would have an inbreeding coefficient of 25%. The Miles City cattle are mostly in the 30%'s and many without linebreeding showing up in the 3 generation pedigrees. Most of the inbreds I have are probably higher than the Miles City cattle in inbreeding coefficient. When the performance collecting craze started, the instruction was to group calves into as many different contemporary groups as possible in order to increase accuracy. [/QUOTE]
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