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<blockquote data-quote="novatech" data-source="post: 615199" data-attributes="member: 5494"><p>Any trait or syndrome is the result of 2 animals having like genes that happen to match up. Genetic diversity has its place and can be used to personify quality traits as well as enhance existing traits. The reverse is true as you don,t always get the genes you want. Sometimes you get genes that pop up that are undesirable. Breeding close can be used to strengthen genetics. But it is the same as out crossing, sometimes you don't get what you want. Either way you do it, it is all about culling as to not let the bad genes pass down to future progeny.</p><p>The quantity of bulls to select from with AI is far greater than that of live bulls when one considers the quality you get for the price. I have no idea how many years the Hereford people have been collecting semen or how far back one can buy semen but I am sure there is a tremendous choice. There are certainly enough choices so as not to worry about breeding close for what ever reason that would bother you.</p><p>Natural service would limit the number of bulls used on a herd. With AI multiple bulls can be used on the same herd.</p><p>There are certain bulls I want to show up in the pedigree of the animals I select. The more times this particular bull shows up the more I like it. This bull may be 5 to 10 generations back in the pedigree. Although I know those genes have been diluted I still am bringing a small amount forward. The reverse is true. There a certain bulls I do not allow in the pedigree as to not allow certain bad traits to be brought forward. </p><p>Many AI bulls have been proven over time. One simply cannot get the same proof with a new herd bull, although predictions can be made to some degree.</p></blockquote><p></p>
[QUOTE="novatech, post: 615199, member: 5494"] Any trait or syndrome is the result of 2 animals having like genes that happen to match up. Genetic diversity has its place and can be used to personify quality traits as well as enhance existing traits. The reverse is true as you don,t always get the genes you want. Sometimes you get genes that pop up that are undesirable. Breeding close can be used to strengthen genetics. But it is the same as out crossing, sometimes you don't get what you want. Either way you do it, it is all about culling as to not let the bad genes pass down to future progeny. The quantity of bulls to select from with AI is far greater than that of live bulls when one considers the quality you get for the price. I have no idea how many years the Hereford people have been collecting semen or how far back one can buy semen but I am sure there is a tremendous choice. There are certainly enough choices so as not to worry about breeding close for what ever reason that would bother you. Natural service would limit the number of bulls used on a herd. With AI multiple bulls can be used on the same herd. There are certain bulls I want to show up in the pedigree of the animals I select. The more times this particular bull shows up the more I like it. This bull may be 5 to 10 generations back in the pedigree. Although I know those genes have been diluted I still am bringing a small amount forward. The reverse is true. There a certain bulls I do not allow in the pedigree as to not allow certain bad traits to be brought forward. Many AI bulls have been proven over time. One simply cannot get the same proof with a new herd bull, although predictions can be made to some degree. [/QUOTE]
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