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首页> 外文OA文献 >Genetic and economic evaluation of genetic improvement schemes in pigs. ndash; II. Comparison of selection strategies in a three-way crossbreeding scheme
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Genetic and economic evaluation of genetic improvement schemes in pigs. ndash; II. Comparison of selection strategies in a three-way crossbreeding scheme

机译：猪遗传改良方案的遗传和经济评估。 – II。三向杂交方案中选择策略的比较

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Alternative selection strategies for a three-way cross in pigs (Pietrain as the sire line and Large White boarsmated to German Landrace sows to produce the F-female) are investigated to maximise both genetic gain andprofit. The number of nucleus sows in the main female line (German Landrace) can vary within a wide rangewithout noticeable effect on the genetic and economic response. Productive lifetimes of approximately one yearare recommended for nucleus boars and sows after the progeny test. Boars mated to produce crossbreds shouldbe used longer, especially in the terminal sire line. F-sows can have a productive lifetime of more than twoyears and can be used close to their biological maximum.Four testing schemes are compared and the contribution of the three breeds to the return is evaluated. Testingcrossbred animals at a central test Station cannot be recommended. This capacity should be used to test purebredanimals. Both monetary genetic gain and profit are higher in a scheme with a self-performance testing of boars atStation, in comparison to a scheme with only progeny testing at Station, by 36 and 68%, respectively. Due to areduced generation interval, using boars to produce breeding boars straight after their self-performance test leadsto a further increase of monetary genetic gain by 5% and profit by 13%. In all schemes, selection in Pietrainleads to the highest return due to the highest gene proportion in and its shorter distance to the terminal productand the therefore faster transfer of genetic gain.
机译：研究了猪的三向杂交的替代选择策略（Pietrain作为父系，大白公猪与德国Landrace母猪繁殖以生产F雌性），以最大化遗传增益和利润。主要雌性系（德国地方品种）中有核母猪的数量可以在很大范围内变化，而对遗传和经济反应没有明显影响。后代测试后，建议公猪和有核公猪的生产寿命约为一年。交配产生杂种的公猪应使用更长的时间，尤其是在终末公猪系中。 F-母猪的生产寿命可以超过两年，并且可以接近其最大生物学寿命使用。比较了四个测试方案，并评估了三个品种对回报的贡献。不建议在中央测试站对杂交动物进行测试。此容量应用于测试纯皮动物。与仅在站进行后代测试的方案相比，在站进行了公猪自我性能测试的方案中，货币遗传收益和利润分别更高，分别为36％和68％。由于缩短了世代间隔，公猪在进行自我性能测试后立即使用公猪生产繁殖公猪，导致货币遗传收益进一步增加5％，利润进一步增加13％。在所有方案中，Pietrain中的选择都将导致最高的回报，这是因为其基因比例最高，并且其与最终产物的距离更短，因此可以更快地转移遗传增益。

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